I took her to the vet ($50 for a 5 minute visit

) and she has no infection or bone issues. She does have another back tooth that's loose - he said sometimes it just happens.
He wanted to pull it, said it was loose enough, but I know Bella and she couldn't have handled the stress of it (has addisons disease). As it was, it was a fast, uneventful appointment and she came home and slept the rest of the day and seemed depressed and a bit listless.
I am going to have her and my other girl spayed next month and he can easily pull it then.
Thanks