Looking for the parents of Mary Ann SEARS

My 4X Great Grandmother was Mary Ann SEARS; born about 1810 in Ohio. She married Andrew MARTIN 10 March 1828 in Montgomery County, Ohio. They had 10 children, two were born in Ohio the rest were born in Randolph County, Indiana.

The last census that I can find her was 1880; she was living with her daughter Mary Ann MARTIN BRAKEFIELD in Minnisota; where she passed away.

Finding Mary Ann after she was married has been easy but I can't find her parents. I've found 4 Sears living in Ohio at the time of the 1820 census. But I'm not sure any are who I'm looking for. Any tips.