How do I get Mom's state guardian revoked? They do nothing to take care of her.

My mother, who has Alzheimer's, has a state guardian for her person and her finances. They do nothing to take care of her at all. They have been by to see her once. She's had a chronic toothache and they will not pay for it. They have not paid her health insurance and will not reach out to me, her daughter. I have power of attorney, but that doesn't seem to have any weight.