First of all, you would not need the power of attorney to show you do not have the power to sign checks. You would need to show that you in fact did not sign any checks so the power is useless in that regard. As my colleague stated you could keep a copy of the power of attorney and contact the district attorney. You could also resign as agent and/or simply refuse to act on her behalf.
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I agree with my colleagues. I would also add that you do not have ANY liability with regard to a POA that you have not acted under. Your friend is apparently no longer of sound mind. I would make a copy of the form and return the original to her, along with a signed and dated letter indicating that you have never acted under the form and that you refuse to do so, in the future. You will want to keep a copy of that letter, as well.
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