Go to PetSmart (if you have one there) and buy some Cat Sip milk for cats!!! Also, open a can of water-packed tuna... she probably won't eat the tuna, but will lick the juice, which is mostly WATER!!!
If these things don't work, she will need subcue fluids! You can also force Nutri-Cal dietery supplement in her mouth! Be sure to get some Terramycin for her eyes, because they will get worse if you don't!

Let me know if you need any more help!!!

Hang in there!