jode88:Would that cause an upset belly if she;s never had one.
Boy, the list of things that can cause an upset belly is quite long. Here is a start - eating something she shouldn't (insect, mouse, etc.), intestinal virus, intestinal parasite, intestinal worms.
A couple of Tbs of plain (not spiced), canned pumpkin will help to firm up her stool.
You could also pick up some Safe-Guard granules at a pet store (or feed store) and deworm her. Safe-Guard is a safe, gentle dewormer and is the same as Panacur that you could get from the vet. It will kill roundworms, hookworms, whipworms, Taenia tapeworms, plus the parasite Giardia (bad water).
DO NOT use any pet store wormer other than Safe-Guard!! There is some pretty toxic stuff out there.