Boil some rice and put it in with her new food.
Get a can of pumpkin and mix some of that in.
I have used Immodium D successfully, but some here advise against it.
The published dose is 2 mg (the standard-size capsule) for each 40 pounds of body weight, two to three times daily (this translates into 0.1 mg per pound).
Try this site: