I feel so sorry for your friend. Unfortunately it is happening alot in this country;. Including in the medicare/medicaid area. Doctors aren't getting paid enough so they drop their patients.
If your friends Docs. are not in the HMO, they can do this. It may not be moral but they can. To find a new doctor quick, have her call her local hospital advocasy gourp. Almost all big hospitals have such an organization. They may be able to provide a new physician referral. Also the doctors she had, if they care at all should provide a referal to someone they know.
Womens resource centers also may have ideas to help. They too are in most big cities, even in local communities. Lastly there are the clinics, that are based on your finances, some are free clinics.
The important thing is for her to find a new PCP right away. As that is the doctor who makes suggestions on what specialists she may need.
I sincerely hope your friend is able to find a quality, compassionate doctor quickly. She must be very upset. You are a good person for trying to help her like this. I will keep both of you in my thoughts. ginnie