Mom (93, dementia) developed loss of taste from meds. Loss of appetite followed, not eating. She's angry and stopped taking meds. Advice?

I moved in with mom after Dad passed away. I lost job due to pandemic, and I just acquired new job after 18 months. Mom was/is? self-sufficient at home alone, (my sister would assist with doctor visits and visit her weekly) but dementia has created resentment and paranoia at me for getting a job. Blames doctor and me for her loss of taste and appetite, resents my sister for helping out. No POA, and she refuses to go to doctor thinking we are trying to put her away. I just want her checked out since no meds or food in over a week. Her doctor basically said not to force meds but let her be, but to get her to emergency. Her paranoia has caused a resentment of me so strong, that she thinks I'm trying to poison her. At 4:00 a.m one morning she threw out all the food I prepared for her. How do I get her to the doctor? If I call an ambulance, she will refuse to go. Can they take her anyway?