Hello, and welcome to HCM!
Your sister should contact her Medicaid insurance provider and request a list of specialists that accept her insurance. There will be specialists available, but it may take a long time to be seen, and may not be located close to where she lives. Unfortunately, access to specialists is frequently difficult for patients with Medicaid. In the meantime, she should find another general practice doctor who is comfortable with treating her symptoms (some primary care
doctors do this, others don't).
I wish you good health, and thank you for posting on HCM!