Hello, my name is***** and I have over 20 years of experience as a veterinarian. I completely understand and support your concern about your new puppy being fed a raw diet.
Exposure to bacteria from a raw diet (e. coli or salmonella being the two of most concern) is a concern for a healthy individual let alone someone such as yourself.
Raw diets can be extremely dangerous for an immunocompromised individual. The trouble is that even if you successfully convert her to a commercially prepared dog food, and this would need to be done slowly to avoid gastrointestinal upset and vomiting/diarrhea in her, she can still shed bacteria that could make you sick. Once bacteria are established in the gut it can be tough to rebalance the gut bacteria to a more appropriate population. So even if she appears healthy that doesn't mean that she cannot get you sick. There are chronic shedders of salmonella that appear healthy.
I would urge you to find another puppy if the breeder is unwilling to wean the puppies onto a commercial diet.
Many North American veterinarians feel so strongly about raw food risks that their national association, the AVMA or American Veterinary Medical Association, has come up with a position statement clearly stating the concerns. See this link:
I think that clearly and succinctly states the concerns that you are feeling.
Please let me know if you have any further questions.