Mother in assisted living and bills are being sent directly to me. What is the best way to handle this?

My mother recently changed assisted living facilities. She is on a monthly spend down with Medicaid that goes directly to the facility and that along with her cost is debited directly from her checking account each month. I've noticed this new facility is sending me a statement each month along with any other bills directly to me. I have ask them to send in her name and in C/O to my name. I have financial DPOA and as such do pay all her bills but don't want to take a chance on being made directly responsible for her bills from my finances. Is this the best way to handle this or should I have a lawyer draw up guardianship and go that route. I have been relying on the DPOA and DMPOA to get things done and haven't run into any problem so far. When she was admitted I had her sign all admission papers and only signed where it was required as DPOA.