Bless your heart, 5 dogs with diahrrea at one time.
You can also give her Rolaids for the upset stomach. Annie was 5 lbs and I would give her 1/2 to 1 whole Rolaid, depending on if she'd take it all. Just break it in two and offer it too her like a treat. The can pumpkin has always worked good for me to firm up loose stools.