I hope she is doing better. Diarrhea can be a scary thing if it goes on..
Chachi's mom is right, they can dehydrate very easy. I had a Yorkie that dealt with bouts of colitis, they would get brought on by stress or and boy was that tough to get rid of even with med's... I hope this isn't anything more than a bug and some medication to help bind her back up... Keep us posted.