I'm guessing you meant (Albany or) Saratoga? NYS birth records are difficult to find for those years, there is one Margaret E. Bentley marriage listing for 1891 in Burnt Hills (Saratoga County) to Frederic E. German. There are several other Margaret Bentley (or close name) for various upstate NY marriage places without the E. middle initial mostly much later in time period. I can try some other sources with a bit more to go on - can you explain a little more her connection to the Sarah's Bentley's 1700's profile?
There is a FindaGrave for a Margaret E. Bentley 1849 (Rexford, Saratoga County) - 1869, Father Ransom Bentley.