I'm Doug, and I'm very sorry to hear of your mother
's situation. My goal is to provide you with excellent service today.
You are talking about a springing durable power of attorney which only takes effect on the determination by a treating physician or court of incapacity.
Once this sort of a POA has been activated, the person subject to it may not simply terminate it by revocation. They have to get a court order to terminate it based on having re-acquired capacity and this will require her physician to testify in a capacity hearing.
You can assist your mom by retaining an attorney to represent her if she wishes to contest the finding of incompetency by her physician or the facility physical who cause the POA to spring into existence with the diagnosis.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2015,