I can't see the bottom of the cage in the photo....is there an egglaying bin there?
I'm not a vet so this is just from my experience and that if others and from what I've read.
From the look of her she is carrying eggs...and from her behaviour she is likely eggbound and can't lay them. When a chameleon doesn't lay the eggs when she should, and starts behaving lethargically, etc...it won't be long (maybe a few days..maybe not) until she dies. Your only chance, if this is what's happening, is for her to see a good chameleon vet like yesterday.