Here is a reference for Mary (Roberts) wife of John Thayer, II but I question the reliability.
My Mother's Branch:The Lineage and Life of Carrie Viola Reeves and Her Family By Doyle W. Williams
https://books.google.com/books?id=x9-jBAAAQBAJ&pg=PA599&lpg...
Pg.599
1557 -Married Mary ROBERTS (aged 22); Thornbury, Gloucester County, England
Pg.605
-14. Elizabeth FREMINGHAM (1502-1587)
Carrie's 12gGrandmother
b. 1502 at Kent County, England
m. Fnu ROBERTS at England
d. 1587 at Kent County, England
Elizabeth's Parents: James FREMINGHAM (1470), Elizabeth WALWORTH (1474)
Elizabeth's Children: Mary ROBERTS (1535)
Also
Mary Roberts1
F, #72876, b. circa 1533
Mary Roberts was born circa 1533 at of Thornbury, Gloucestershire, England. She married John Thayer, son of John Thayer and Constance Holbrook, in March 1557 at Thornbury, Gloucestershire, England.1 Mary Roberts was buried on 20 April 1611 at Thornbury, Gloucestershire, England.1
Family John Thayer b. c 1531
Children
Richard Thayer+2 b. 2 Aug 1562
John Thayer+1 b. 26 Oct 1567
Citations
[S11674] Genealogy.com, Ancestors of Stanley Elmer Allen.
[S61] Unknown author, Family Group Sheets, Family History Archives, SLC.
http://our-royal-titled-noble-and-commoner-ancestors.com/p2425.htm#...
Tayer (Thayer) family entries in the parish register of Thornbury, Gloucestershire, England by Faxon, Walter
https://archive.org/details/tayerthayerfamil00faxo
https://archive.org/stream/tayerthayerfamil00faxo#page/3/mode/1up
Baptisms
4 Jan. 1557-8. Johes Tayer. Godfathers: Johanes Williams, Johannes Tyther. Godmother: Elizabeth Cooke.
.... etc
7 Nov. 1559. Thomas Tayer. Godfathers: Thomas Moore, Johanes Barton. Godmother: Elizabeth Whitfield.
.... etc.
2 Aug. 1562. Richardus Tawier. Godfathers: Richardus Cheyre, Walter Howks. Godmother: Elizabeth Picher.
.... etc.
1 Nov. 1564. Whilihelmus Tawier. Godfathers: William Bruton, Johannes Jonis. Godmother: Joyce Griffings.
.... etc.
16 Dec. 1565. Alicia Tawier. Godfather: Richard Griffing. Godmothers: Alicia D[ ]rnt, Elizabeth Howell.
.... etc.
23 Sept. 1568. Luci Tawier. Godfather: Johanes Driver. Godmothers: Luci Baker, Catherina Rippe.
.... etc.
13 Aug. 1570. Anna Tawier. Godfather: Thomas Marten. Godmothers: Agneta Ady, Alice Laurence.
23 Mar. 1572[-3]. William Tawyer. Godfathers: Robert Eslineton, Johanes Jonis. Godmother: Johana Bartone.
25 Jan. 1573[-4]. Nicholas Tawier. Godfathers: Nicholas Adams, Thomas Holdbrooke. Godmother: Johana Tocker.
26 Oct. 1577. Edward Tawier. (Christened.)
25 Apr. 1579. Ursula Tawier. (Christened.)
6 Jan. 1581[-2]. Anthony Tawier. (Christened.)
.... etc.
https://archive.org/stream/tayerthayerfamil00faxo#page/7/mode/1up
Marriages.
30 Apr. 1597. Thomas Tillad to Alice Tawyer.
15 Oct. 1599. Nicholas Tayer to Jone Stones.
4 Nov. 1599. William Pytch[r] to Ussly Tayer.
.... etc.
https://archive.org/stream/tayerthayerfamil00faxo#page/8/mode/1up
Burials.
21 Aug. 1558. Johes Tawier.
11 Feb. 1561[-2]. Johes Tawier.
11 Feb. 1561[-2]. Willihelmus Tawier.
19 Mar. 1561 [-2]. Constans Tawier.
13 Jan. 1565 [-6]. Willihelm Tawier.
6 Mar. 1565[-6], Thomas Tawier.
5 May 1571. Agneta Tawier.
20 Nov. 1572. Wilihelmus Tawier.
17 Mar. 1573[-4]. Thomas Tayer.
4 May 1576. Johana Tawier.
4 July 1579. Secilia Tawier.
12 Oct. 1584. John Tawier.
11 Sept. 1586. Catherine Tayer.
13 Dec. 1586. Alice Tawier.
16 Aug. 1587. Anthony Tayer.
8 Nov. 1590. Jane Tayer.
10 Nov. 1590. An Tawier.
10 Nov. 1590. Ann Tawier daughter of above born, and buried at the same time as her mother.
5 Feb. 1592[-3]. Jone Tayer.
26 Apr. 1593. Margaret Tayer.
14 Feb. 1594[-5]. Thomas Tayer.
1 Jan. 1600-1. John Tayer died, buried 4th day.
18 June 1603. Margaret Tayer.
15 Mar. 1606-7. John Taire, son of Richard Tayre.
11 Feb. 1609 [-10]. Thomas Taire, son of Edward Taire.
12 Oct. 1610. John Taire, son of Richard Taire.
20 Apr. 1611. Mrs. Mary Cooke (whose Sister [sic] in law was Thomas Tawyer who died in Anno 1593).
15 Nov. 1612. Alice Tawyer.
13 Dec. 1619. Ursula Tayer.
10 July 1621. Wilfrey Tayer.
12 June 1622. Welfrey Tayer.
25 Feb. 1622[-3]. Bartholomew Tayer.
3 Mar. 1 622[-3] . Thomas Tayer.
3 Oct. 1626. Jonathan Tayer.
2 May 1627. Ursula Tayer.
24 Sept. 1627. Marie Tayer.
5 Nov. 1627. Edward Tayer.
3 Dec. 1627. Thomas Tayer had a child buried not baptised.
.... etc.
The New England Historical and Genealogical Register
https://books.google.com/books?id=0NZ3KVrMcb8C&pg=PA288&lpg...
Pg.283
Pg.287
Pg.288
Same as in Tayer (Thayer) family entries in the parish register of Thornbury, Gloucestershire, England
New England Families, Genealogical and Memorial: A Record of the ..., Volume 4 edited by William Richard Cutter
https://books.google.com/books?id=NfksAAAAYAAJ&pg=PA1915&lp...
https://archive.org/details/newenglandfamili04cutt
https://archive.org/stream/newenglandfamili04cutt#page/1947/mode/1up
Pg.1915
The following facts about the English ancestry of the Thayer family are taken from a book entitled "The Thayer Family of Thornbury" by Thomas Thayer Ojeda, 1907.
(I) Johanes Tawier, the first known English progenitor, married very likely Constans or Johana Tawier. He died March 19, 1561-62, and she died May 4, 1576. The earliest mention of the name of Tayer in Thornbury, Gloucestershire, England, is among twenty-six tenants who made presentment of the customs of the Manor in 1550. As only the surname was given, doubtless he was the only one living there by that name. He may have been this Johanes Tawier. Their children probably were : Willihelmus, born February 11, 1561 ; Jone ; Johanes; Thomas ; Constans ; Agneta ; Alice.
(II) Johanes (2), son of Johanes (i) Tawier, marrie/d Mary (Roberts) Tawier. His name is mentioned as a godfather in 1565-67-68-69. He died October 12, 1584. His widow married (second) —— Cooke, and she died April 20, 1611. Children: Johanes, born January 4, 1557-58; Thomas, November 7, 1559; Johanes, May 6, 1561 ; Richardus, mentioned below ; Johanes, February 28, 1564 ; Willihelmus, November 1, 1565; Alice, December 16, 1566; Ussly; Lucy, September 23, 1568; Anna, August 13, 1570; William, March 22, 1572-73; Nicholas, January 25, 1573-74; Edward, October 26, 1577; Ursula, April 25, 1579; Anthony, January 6, 1581-82, died August 16, 1587.
(III) Richardus (Richard) Tawier or Tayer, son of Johanes (2) Tawier, married (first) —— (Gibbs?) Tawier; she died November 10, 1590. He married (second) —— (Dimery?) Tawier. He was living in 1625. Children by first wife : Catherine, born June 24, 1586; Alice, October 23, 1587; Margaret, December 23, 1589; Ann, November 10, 1590, died same day. Children of second wife : Joane, born January, 1592-93; John, April 17, 1593; Mary, March 1, 1595-96; Thomas, mentioned below; Wilfry, January 1, 1599-1600; Richard, April 5, 1601 ; Catherine, February 24, 1603-04; William, May 5. 1605; Margaret, June 10, 1606; Agnes, March 15, 1607-08; John, April 29, 1610, died October 12, 1610; John, December 26, 1627-28.
(IV) Thomas Tayer, son of Richardus (Richard) Tawier or Tayer, was born August 16, 1597. He married. April 13, 1618, Margerie, daughter of Abell and Jane (Tayer?) Wheller, of Thornbury. He was in Boston, Massachusetts, before February 24, 1639-40, and settled at Mount Wollaston, afterwards Braintree, Massachusetts, where he died June 2, 1665. His will was dated June 21, 1664. Children: Ursula, born November 18, 1619; Welfrey, May 20, 1621 ; Thomas, September 15, 1622; Ferdinando, April 18, 1625; Ursula, October 8, 1626; —— , December 3, 1627, buried and not baptized; Shadrach, mentioned below; Mary, June 24, 1630; —— , December, 1632,. buried and not baptized; Sara, born in New England; Hannah, in New England.
(V) Shadrack Thayer, .... etc.