Hi Jason,
I believe that I might know a little about Mary Stockbridge. My 2nd great-grandmother was her sister, Tirzah Stockbridge, born 28 Sep 1798 in NH. I don't have an exact town but the family was probably living in or near Newmarket or Durham, NH area because Tirzah's husband, Benjamin Sias Smith was born in Newmarket,Rockingham, NH. I was given a family photo recently that was a photo of Mary and on the back was some important information, as yet unconfirmed by records, that Tirzah & Mary's parent died while they were young and raised by a Stevens Family. I also have a photo of Mary Stockbridge and husband Robert, without his last name. I hope this means there is a connection to your Colliers. BTW, one of the photos of Mary was made by a Canadian photographer in Hamilton, Ontario which is nearby to Bath, NY. Also on the back of the photo is Mary's birthdate: 2 Sep 1800 and Robert's birthdate of 12 Mar 1796 and it says both were buried at Eagle Valley near Sloane (sp?)and that they had 12 children. I can't seem to find that cemetery. Do you know if the family stayed in the Bath area?
Tirzah's death certificate lists her parents as John & Mary Stockbridge of England. I have been unable to find any information on the parents.
Hope this helps.
Abby