Nevermind.
This game frustrates me to no end!
I have created many Sim families and saved them all to Bin. I have one Sim that I have to keep looking for in old saves, find her and save her but she never shows up in the bin. I shouldn't have to work so hard for this game.

I just had a thought. Can you only have so many families in the bin?
Edited: I did it again and she stuck this time.