corrections to info in above message:
Leah Van Buskirk did not die 4 Jun 1855 Orwell NY as stated in the Ouderkerk Family Genealogy, Vol II. Leah appears in the 1855 Orwell, Oswego, New York census, taken 19 June 1855. Her signed her application for a pension, as widow, for war of 1812 on 19th day of June 1855. She did not die 4 Jun 1855.
Leah Van Buskirk is not the daughter of Martin and Maria (Van Ness) Van Buskirk. Leah/Lanah dau of Martin and Maria (Van Ness) is living with her sister in law Cathalina Pruyn (Wife of Richard VB) in Hoosick, Rensselaer, NY in 1855 census on 21 June 1855. She can't be in both places, Orwell and Hoosick.
Likely parents of Leah Van Buskirk, wife of Abraham Ouderkirk, are Peter Van Buskirk and Elizabeth Lampman. In her application for a pension, as widow, for war of 1812, she states that She and Abram were married in Hoosick, NY on ___ Apr 1802 by Aaron Haynes a minister of the Gospel. In the 1800 census Aaron Haynes is a neighbor of Peter Buskirk and Isaac Ouderkirk (Abram's father) in Hoosick, Rensselaer, NY. In 1800 census Peter Buskirk has 1 daughter 10-16, possibly Leah. This daughter cannot be the other known daughters of Peter, Neeltje and Anna, because they are over 16.