If she has regained her competency and is able to make her own decisions than she can revoke the Power of Attorney. If the power of attorney was through some type of guardianship or conservatorship she will need to petition the court to terminate it. The judge will want a report from her doctor and/or treating facility indicating that she is capable of making her own decisions.
Answered on Nov 15th, 2013 at 9:25 PM