Assuming I have the correct Mary Stiles #77 in the cited genealogy. She inherited from her parents a piece of the "Great Meadow" and a piece in Windsor on the Rocky hill side, which sound like the same two pieces she owned at death. She was single (called Mary Stiles) at the making of her parents will in 1789, and evidently remained single when she died.
I found Mary's will buried in someone else's (not indexed)
She left her estate to her two single sisters Margaret and Abigail. Looks like Abigail died shortly, because Margaret was the only surviving sister later in the year. Mary also owned one third of the house she and her sisters lived in and one third of some other lots.
Connecticut County, District and Probate Courts. Connecticut State Library (Hartford, Connecticut); Probate Place: Hartford, Connecticut Probate Packets, Stevens, Clarissa-Stillman, T, 1641-1880. Accessed at Ancestry https://www.ancestry.com/interactive/9049/007627887_00786