Border collie puppy has explosive diarrhea?

its at least 7 or 8 times a day for 5 days now. born just berfore thanksgiving, she is growing like a weed so we put her on adult dog food. could this be it? is it worms? she lives indoors and she is ruining every floor in the house, ive tried puppy pads and treats for going outside and nothing works, i have a westie and she lives inside and this never was an issue. is this something i should be worried about? what can i do? someone told me to feed her rice cooked in beef broth to sooth her little tummy, im at a real loss here