I have not been able to find her parents' names. I have found her on Find A Grave, on the Averill Project website, and on a document for the Forsyth Cemetery.

Sarah Grover was born 3 Apr 1786 in Parker's Island (near Georgetown), Maine and was married to Israel Avery.

I wish I had more information.

p.s. I noticed your last name is Aanerud. I have several Aanerud/Aanrud's in my family.