Sister with POA has taken over Mom's bank accounts put name on title to home. What to do about this power of attorney turned god complex?

Mom didn't know.

Behind everyone back younger sister had parents sign over POA to her. Dad had been declared incompetent but still signed and mom thought she was signing for something else. Sister used Hospice agents and APS to facilitate her wishes and has now transferred title to the house and all accounts into her name. I'm about to be evicted after 10 years as caretaker of the home and care provider of parents along with younger sister.

Father was in decline and under Hospice care and on heavy doses of morphine at the insistence of my sister. He passed on Christmas day.

I'm concerned for mom as she has become more angry every day finding new faults in everyone and bringing up old issues like they happened yesterday. I know my sister is feeding her a lot of stuff that is creating a lot of anxiety and insecurity for mom. Mom has been isolated from several siblings who have been ordered not to "upset" her. Myself included. Same it was with dad who didn't see his kids much in the final days.

What to do about this power of attorney turned god complex?