Looking for a Helen McQueen, married to Alexander Morison in 1802 (?)

Hello, everyone!

This is my first attempt at researching my matrilineal line, and any help you could give me on this person would be wonderful. Helen McQueen was apparently from Troy Mills, NY, and had a daughter named Helen Blair Morison, who would have been born 4-28-1863 and died 10-20-1930. The reason I put a question mark by her marriage date is because I'm not sure if those dates are correct, since it seems an awfully long time between Helen McQueen's marriage and the birth of her daughter.

Any advice you could give would be greatly appreciated!