You can always tell your friend it's not too late to switch caregivers. Also, tell her that you are willing to go with her to interviews of MW/OBs in the area.
Tell her to hire a Doula or a Montrice. If you hire a Montrice, then they will be able to do monitoring and vaginal exams in labor while she is at home, so she is sure to get to the hospital fully dilated and really ready to push. A Montrice does all the same stuff as a Doula, just some medical stuff too.
They can't MAKE you her have a cs. It's surgery, you have to have informed consent. A Doula will help fight this system and thinking on arrival to the hospital. Also, A Doula will help her have a birth she wants regardless of how it turns out.