What if two people are POA and health care proxy for one person, how does that work?

Okay, I am one POA who does all of the financial and the health care. I am the one who got Mom help. Put her into nice health care facility and she is private pay until Medicaid will kick in after her money is exhausted. I am the one to be called if problem at the facility. Other POA has not expressed any interest in helping until all is done now and now she appears to be so concerned and only wants recognition. I do all of mom's taxes, bills etc. How much input does other POA have when she has not bothered before. I am also Mom's executrix of her will once she passes.