Hi Nosh-
SG is absolutely right, you should take a stool sample to the vet to determine if she has giardia and/or coccidia. Mine have had both. The coccidia cleared right up with the meds the vet prescribed. I can’t remember what it was called. Metronidazole and Panacur is typically prescribed for Giardia and may take a few rounds to get rid of it. These should be taken care of ASAP if she does have them. They can cause damage that takes a while to heal if not cleared. Grain free and Slippery Elm will not get rid of the diarrhea if she still has “bugs”.
What kind of dog is she and how old? How awesome of you to save this pup!
