Maybe finding out all you can about her siblings and children would yield some clues. There were quite a few Buell in Central NY and a couple Harvey. Fort Ann is quite some distance from the Canadian border, south of Lake Champlain near the Vermont border. The town of Marcellus, formed in 1794 later split off other towns. Spafford is in the southwest part of the town, sitting between Skaneateles and Otisco, the easternmost Finger Lakes. The hamlet of Borodino is in that area.
I do remember reading that many/most who were awarded a military tract did not actually settle there, but rather sold it. Onondaga’s Centennial: Gleanings of a Century by Dwight Bruce mentions Mark Harvey as one of the first business owners in Borodino (a tavern) and lists among early Borodino settlers Medad Harvey. History of Onondaga County by WW Clayton lists several Harvey living near Thorn Hill including Mark, Paul, Adeline with birth dates and places and when they settled in the area.