If a copy of the Sim exists in the bin, it's possible that there's another "her" walking around. I haven't experienced it, but my sweetie has. He said it was quite disconcerting bumping into an elder version of his character when he was out and about. (I guess his other self aged faster). I said that at least it didn't cause a rift in the space-time continuum.
Oh em gee, that is hilarious! Lol. Damn, so is it safe to delete copies from the bin? Hmm, I recall seeing a topic about such a thing, I think. *off to search*
Edit: Yes, I've spotted the clone. If I delete households out the Library, will that stop this?