It wasn't ever established that she lived there until she came into the story at all, essentially. The reason she's conveniently there is because a convenient contrivance happens to exist. And she happens to also be wealthy, reclusive, and secretive by nature, all of which just happens to conceal the person she has rescued instead of being Bob Smith who would just take him to a hospital or whatever.
It's pretty implausible even given everything else.
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