If your sister is mentally ill, then she may not be capable of executing a valid power of attorney at all. If that's the case, then your recourse is to file a petition to have her adjudicated an incapacitated person and have yourself appointed as her guaridan. If you are successful, the fees/costs of the proceeding would be paid from your sister's assets.
Answered on Jan 15th, 2018 at 11:28 AM