Re: Hanna Cresy (Cressey,Creasy) b. 1777
There is a family tree on Ancesstry.com with the family of John and Susanna McDonald Cressy/Cresey.
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John b 22 Feb 1749 Gorham, MEd 23 Dec 1842 Buxton, ME
Sussana McDonald1751 Gorham, MEd 7 Apr 1834 Buxton ME
Gorham and Buxton are adjoining towns
Tree lists Hanna as a daughter born 22 Apr 1777 d 22 Nov 1846
(this tree does not have spouse for Hanna)
I would think you are very lucky to have a birth certificate from 1777 and that would be validation of her birth.
Often local historical societies also have records of early families and vital stats.Also, you might try public libraries with local history and families.