White rice is good too for runny stools. It should firm them up. You may want to feed her a bland diet for a couple of days. By this I mean, boiled chicken and rice.

what about probiotics? They may help get her digestive system back on track especially if she's on meds....Udo's oil has different probiotics for different purposes including digestion. I gave the Super one to my dog when she was on antibiotics....just opened the capsule and sprinkled it over her food.