Update! :-)

[tabaxipanther]

Moonbeam is fine!  Well not perfectly fine, but she strained/tore some ligaments in her knee which was causing it to pop in and out (Sound familiar Mike? Too bad there's no kitty knee brace).  She doesn't need surgery (thank Jimi, I don't think I could afford that), but she does need to stay confined to my room for at least 10 days, and is going to have a limp for a few weeks :-(  But hey it could have been worse?  Looks like no more refrigerator perches anymore :-(

So yay!  My baby girl is fine!