I have POA for my Mother. She also has a Living Will Do I also need to be appointed as her Guardian?

Mother is 86 years old with Vascular Dementia, severe Osteoporasis, and other age related health issues. She lives in Senior Apartments and manages to be mobile with her walker with wheels. She has someone who comes each day and does light housekeeping. She gets Meals on Wheels for Lunch each day and I keep her supplied with pre-cooked food I make ahead and freeze or bring by for her. I take care of her shopping, laundry, medications, trips to doctors, etc. I am the oldest of 3 children and the only one still living. I live within 15 minutes of Mom and manage to make this arrangement work for the time being. I work full-time and am constantly concerned about missing too much work. Any legal advice is appreciated.