She actually looks kinda skinny. How much and how often are you feeding her? Also, if she is in fact dehydrated, try offering her water orally with a plastic syringe (no needle, of course) or an eye dropper. You can drip it on her nose and see if she'll lick it, or try to get it into her mouth and very gently squirt it into her mouth (but slowly so she doesn't aspirate any).