i'm no expert, but it sounds like she has contracted parvo - have they done an ELISA test. this test takes about 15 minutes and confirms a parvo diagnosis. i would be on the phone ordering Parvoguard to be shipped overnight. they have a website
www.parvoguard.com. i did save puppies who contracted parvo by just force feedings pedialyte every hour around the clock, but they were great danes.
a puppy with parvo will not eat or drink and they hide - they act like the water is gasoline and steaks are poison.