Margaret Duffy who married Abraham Hackett

I am trying to find the parents of Margaret Duffy b. abt 1837, supposedly Ireland (she married Abraham Hackett in Sayabec, Quebec)

According to the 1881 Quebec census she was born in Ireland. Her marriage to Abraham said she was from PEI. This being the case I suspect she lived in PEI after moving to Canada from Ireland.

To-date, I have two sets of parents that had a daughter Margaret b. abt. 1837

1. Patrick Duffy and Margaret Ann Heartz both of PEI

2. Carbery Duffy 50 and Eleanor 42 left County Roscommon, Ireland and arrived at Grosse-Ile, Quebec in 1847. According to Grosse-Ile the family arrived with four children:

1. Margaret age 9
2. Patrick age 6
3. John age 4
4 Catherine age 1 month.

Grosse-Ile has the date April 9, 1847 but I believe this is the date the family left Ireland and not arrival date.

I would appreciate help in proving or disproving if Carbery and his wife Eleanor are the correct parents.