Okay so we could have her appear somewhere in the land, and she could have been like, living off the land or something trying to find her way out (because the house has lots of acres of woods and streams).
Sounds great. She would know familiar plants and whatnot anyways because her mother taught her how to choose good plants for medicines and whatnot, and plants haven't really changed all that much since recent history so it would be feasible that she could survive out there.