You NEED to get her to the vet right away. If she isn't taking in water, she can deteriorate quickly. I know you don't want that to happen. The diarrhea could be because she ate something that doesn't agree with her system, have a talk with the vet about it. Hope this helps, good luck.
Yes definitely go to the vet immediately!!! Diarrhea is dehydrating her. Then to not be drinking! The vet will tell you what to do. This is a life or death situation, that only a Dr. Should speak on.