Elizabeth Littlefield is said to have married Lemuel Weeks Crabtree 31 January 1805. Intentions were recorded 2 October 1804 in Gouldsboro, at which time Lemuel Crabtree was living in Sullivan. He is said to have been born in 1784 and to have died in 1837.
Elizabeth Littlefield Crabtree is said to have been born 17 March 1782 and to have died Hancock, ME, 9 February 1872. I suspect that these dates come from her gravestone, which I haven't located. The death certificate of her daughter Harriet (1818-1901) gives Elizabeth's place of birth as Sullivan. The death certificate of her son Agreen (1821-1892) gives her place of birth as "_____ B____ Island" or "_____ B-__t Island," but, try as I might, I can't make out the place name. (The certificate can been easily found on ancestry.com.)
I've studied the list of Maine islands on Wikipedia (http://en.wikipedia.org/wiki/List_of_islands_of_Maine) and none of them leaps out at me as the the one on the certificate.
With all the Littlefield scholarship out there, you'd think that some accessible online source would list the names of Elizabeth's parents and her place of birth.