Legal question?/ What would you do?

Well then what ,if a patients daughter is saying the wrong person is appointed POA, she is challenging this and wants to see Admission Papers,and the Risk management is refusing to allow a meeting, I wanted to help and I know the daughter is right! State Law is when a person is single the Children are the Next of KIN,this Patient signed "NO POA/No Advanced Directives, and discounts the old one ,to facility as well as members of family pre admission Old POA from 2003. It is now 2006. She is insisting that Patients SISTER is not who he wants,as his POA. This patient is post CABG, ">24 hrs emergency " bleeding evaluation",RE-Entry something was very wrong,I knew it, Then there was a rule out for needle count. We were instructed to say Nothing to this daughter. She was terrified for her father. To see her praying and asking,yet staying calm,in fear of her removal
Patients NOK simply wants a second opinion,and if his state is futile then Hospice. This patient later remained on vent, received blood 6 months, moved to forth floor to a HH.NOK's visits were limited by Risk management,and then was removed, she filed and made too many complaints. She was allmost desperate for her father and his comfort,stated he is being tortured and aunt is allowing this ,I am his POA not her!,and the Allowed POA ,a aunt was not active in care,only responded with yes,or a derogatory remark towards patients NOK,like daughter will give pain medication to patient,and POA stated she/NOK made threats. I perceived this as a Power Struggle and nothing less.
What could I have done,This haunts me to this day. What would happen if I located this NOK and told her what I know,really happened,it has been 3 years and statue has passed. It repeats in my mind this poor woman. I should have gone to some one?