You can offer the suggestion of a second opinion doctor. You can even call one for an idea on a phone consult. People don't think well when stressed, and they want to believe the doctor they have is thinking straight.

It took 2 years for me to get my mom away from her bad doctor. Once I convinced my sister (a nurse!) to listen to me, filed a formal complaint against the doctor. It was for more than 4 bad calls/issues! I wish I had been able to do it sooner, she went downhill so in those 2 years (and she "loved" that doctor.)

GO ahead, step in. If you don't now, you will always wish you had. BTW it is just a suggestion at this point, hopefully they will follow up on it