UPDATE:
I took Scout in for an x-ray today. Big surprise - she has a kidney stone! There were no signs of arthritis or a bone fracture so the vet feels her limping and leg pain are from a pulled tendon. Scout will be taking a liquid anti-inflammatory for that.

As for the kidney stone there isn't a lot to do. She said Scout will be prone to urinary problems from the stone - great. As a precaution the vet started her on antibiotics when we went in Monday so if she was having any urinary issues from the stone the meds will help that. She said there is a way to use lasers to break up the stone and let it flush out her system but we aren't to that point yet.

I told her Scout seemed very depressed and hasn't wanted to eat much the past couple of days. She said the Clavamox could be causing some stomach upset and the pain from the tendon could be making her not seem right. Poor girl. At least it isn't arthritis.

I really hope this kidney stone doesn't cause her problems. Anyone here have a cat with kidney stones? What can I expect?