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I am not any kind of authority on the Ober family, but if your Margaret Ober resided at Tremont Maine in the mid-1800's there can be no doubt that she descends from William Ober (born 13 Apr, 1725 at Beverly Mass) and his wife, Hannah P. Monroe (born 10 April, 1740, Billerica, MAss). They moved to Blue Hill, Hancock County, Maine in 1772, and their children settled at Tremont. There are plenty of internet sites that chronicle their families, and I imagine your Margaret will be easilly found there.