Sarah Caswell (Hill) - Sarah Hill's Marriages

A) There is a Sarah (Hill) Caswell (d. 1732) buried in Phipps Street Burying Ground where Abraham Hill and Hannah Stower HIll are also buried.
B) This source [https://archive.org/stream/genealogiesestat01wyma#page/194/mode/2up...] says this Sarah (who died in 1732) married Joseph Caswell after his first wife Rebecca (Sarah's niece) died, but shortly before Joseph Caswell died i Antigua in 1715.
C) a Sarah Hill married John Northey in Boston on Aug 14th, 1701. See [https://www.wikitree.com/wiki/Hill-12194]
D) John Northey was born 6 Mar 1675 and died 31 Mar 1731
E) Sarah Hill could not have been married to both John Northey and Joseph Caswell in 1715.

More information is needed, but one of these marriages seems to be incorrect.