I have decided to step away. I am emotionally and physically drained. I sent my sister a very long text explaining the course of her illness from day one. I also told her I doubt that mom even knows the name of the new antipsychotic medication that was prescribed during her psychiatric stay prior to the third surgery. Her son made a very poor decision but taking her home. Who even knows what medications she has at home. She was still in a wheelchair when she left the facility. Only just starting to ambulate with a walker two days before. It's sad to say and I pray God understands. But I cannot help her anymore. I have to think of my own health, job, family and how this as even affected my marriage in many ways.
In situations where someone threatens to sue you for interference, this is standard advice. IaNAL.
You say this to EMS, sis, police, hospital, rehab...anyone who calls.
That is all ANY caregiver can do.
Let the chips fall where they will. Yout mom is regarded as competent in the eyes of the law; it's time to let her figure this out on her own, or with the help of folks other than you.