Should one expect a live-in caregiver to be able to cook meals for the individual they are being paid to take care of not family member?

My Mother is 90 years old and has not been able to cook for several years. I want to replace caregiver but the poa who has control has been deceived by this young lady. My Mother has told me she complains when Mom has an accident and has told her to stay in bed because she has not gotten enough sleep. My Mother gets up usually one time at night, very rare for a second trip. In addition she has had her children come to my Mother's home to visit and the caregiver put her son's birthday and graduation dates on Mom's personal calendar but failed to put her son in law's, granddaugher and grandsons on and they are all in the same month. My Mother questions me if she should give him money and if she is expecting her to. I have no answers. When she does her light housework she never moves anything, dusts around it. She never tells my Mom when I call nor does she returns any of my texts when I try to call and can't get an answer. I don't live close so I will text her (her preferred method of communication) and hours will pass and I will send another text and she gives me some phony excuse why she didn't text me. I am so upset with this situation that I cannot stand the sight of this cruel individual, which Mom has said she doesn't act the same when her girls are visiting. Don't know what to do becauseI don't believe the POA is seeing things in their true light.