My mother is yelling and has caregiver burnout, will not let home health come help her with my dad. Any advice?

My mother called me last night and stated she got very angry with my father that is approaching late stage of dementia. She’s frustrated he can’t remember her name, the day or even to dress himself when she lays out his clothes. She’s upset he cannot remember things he was told to do immediately. I’m trying my best to let her know that dementia is only going to get worse and that her husband cannot remember things because it’s the disease impeding on his brain. I’ve asked her if she’s made her appt to see a counselor and she’s not answered me. Her doctor has told me that they’ve sent over the referral for her. I’ve asked her about home health and she states that she cannot let anyone in her house to take care of her husband because then what is she going to do? She admitted she couldn’t be at the house with a nurse. Well, that explains why all the therapists that were coming to see my dad are no longer going to see him. I’m also afraid that my father will fall trying to dress himself because he’s unstable and my mother doesn’t watch him dress. The list goes on. Any words of wisdom is greatly appreciated