Honestly she doesn't seem dehydrated. There were plenty of urates in the enclosure when I picked her up that makes me believe shes not completely dehydrated. Although the previous owners said she never shed in one piece, which doesn't surprise me. What about injecting water or pedialite into the rat before offering? I'm not sure if she visits her water bowl enough for it to be beneficial in the water itself.
My husband is pretty good at doing the dead rat dance to get our other bp eating, so hopefully she will take PK and make my life easier lol.