Canned pumpkin. The pumpkin will slow the enzymes down that is giving her the diaherra.
Do you know what is causing the diarrhea? If not it would be a good idea to take her to the vet, because home remedies might slow down the diarrhea, but if it is health related like parasites or she is sick home remedies aren't going to help.
First and for most call your vet when in doubt..but I remember when my dog was sick the vet told me to feed him boiled hamburger and boiled rice. It did help him..
"Diarrhea – loose, unformed stool –can be caused by no more than a minor
gastrointestinal upset or be a symptom of a more serious problem
requiring immediate care. Two of the most common causes of diarrhea in
dogs are intestinal parasites such as giardiasis and roundworm and dietary causes such as switching food too quickly or eating spoiled food...." This is from doggedhealth.com. It goes on to say you should have diarreha checked out by your vet but tells you a bland diet you can use. I linked to the article
gastrointestinal upset or be a symptom of a more serious problem
requiring immediate care. Two of the most common causes of diarrhea in
dogs are intestinal parasites such as giardiasis and roundworm and dietary causes such as switching food too quickly or eating spoiled food...." This is from doggedhealth.com. It goes on to say you should have diarreha checked out by your vet but tells you a bland diet you can use. I linked to the article