My horse got cut a couple weeks ago. I have another two weeks till I can get back on her. She's loosing her muscle pretty quickly, any easy ground exercises that will help?

You could try either lunging her or you might be able to maybe try her over some Cavaletti or something

I'd say just don't work her. 2 weeks isn't long let her relax. Muscle can always be rebuilt up you don't wanna injure her anymore than she already is.

I'd say wait one more week and then just start lunging her over a circle of ground poles everyday for like 15-20 mins. She can trot and canter them.