Get Pet Questions Answered by Pet Experts
There are a lot of causes for runny stools. The first and most obvious is that she needs to be dewormed. If you suspect this, you can take a fecal sample by your vet or take her in for a fecal exam and get the appropriate medication.
If you know that is not the cause, you can try removing her food and starting fresh. Switch her to a diet of only boiled chicken/hamburger and white rice. When her stools are solid, start to add her food back in in small amounts until you phase out the rice mixture.
My biggest concern is that the diarrhea might be caused by an obstruction. Rawhides are not the best treat because they are not digestible. If she swallowed a hunk, she might have a bowel obstruction. Only the liquid part of the fecal matter is squeezing by it. If that's the case, it can be deadly and you should seek vet care immediately.
Let me know if you still have questions.
You should try the bland diet that I mentioned above. It it does not work, I think that a vet visit is needed to rule out a bigger problem.