Bless your heart for stepping in
It sounds like she's going to be a little fighter, being taken away from her mommy, shame on him! But at least now she's being take care of and I hope that she'll get some good meds from the dr. and be on her way. I wouldn't use any flea product on her, no matter how safe they say it is. I heard that vets use Pert Shampoo on very small puppies for fleas, just make sure that she stays warm while you shampoo and dry her thoroughly. Let us know how she is...