How old was she when she was taken from her mom? How old is she now? Most responsible breeders will keep the pups until they are 8 weeks old, and will have started the series of puppy shots for distemper, parvo, etc.
I don't know about bringing a pup into a clinic and leaving her, I suppose it depends on the clinic. I worked at a animal hospital for 3 years, and we did have people come in and "surrender" their pets. Not when the pets were really ill though. If worse came to worse, I suppose you could bring her in and tell them she's a stray you found, you think she's sick and could they please help her.
Best of luck, I hope everything turns out okay!

Peace