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I'm Dr. Kris.
Your girl may have intestinal parasites or an infection. You should take her to the vet for a fecal exam. She may need to be dewormed and/or may need some oral antibiotics. Until you can get her to the vet monitor her closely for bloody stool, diarrhea, vomitting, lethargy and anorexia. At the first sign of any of theose symptoms do not hesitate to take her to the vet.
I hope this helps. Let me know if you need to know more.