Yep. Even if she got that no party stipulation in writing, she’s cooked.
Can you have vacation short term renters sign a waiver that they are choosing to stay in an old house with any potential injury risks that could occur from same? You could include in the waiver receipts from within the last year for roof, electrical, plumbing inspections, say?
I don’t see why the owner is liable. There should be a way to cover your butt if there was no negligence.