PLEASE, PLEASE, PLEASE fill out the form others have linked to. It will only take a few minutes to fill out and it will help us help you and your chameleon. Be thorough and follow the format.
And try to include photos, even if they are only cell phone pics or something. But by only giving us small tid bits of information we can only guess, and not always well. But with the dehydration, it would be benefitial to provide her with a long shower, minimum of 30 minutes. Either use a hand-held mister or stick her on a plant in the shower and point the water at a wall so it bounces off onto her.