I'd get a mouse/rat and have it in a feed box. Sometimes the sent of a rat/mouse will attract them to come out. Unfortuanately I have cats so I know my little meow meows would kill anything they could find, so a mouse wouldn't work for my needs.

I do agree since is the 2nd time this has happened, that a little more "baby proofing" is needed. I hope you find her.