Hi, I'd like to help you with your question.
Your sister can get reduced or free counseling through her local community mental health center. She can either contact her local county government or the United Way for contact information.
She can get therapy, psychiatric services and case manager services (if needed, but in her case it does not seem so) at the center. They may have a waiting list so the sooner she calls the better. They will go over her financial situation with her and help her find a rate she can afford for therapy.
I hope this helps,Kate
Here is an excellent site to help you find a therapist in your area:
Just put in your zip code and it should provide a list for you.
My best to you and your sister. If I can help any other way, please let me know.