Trying to find out if my mother has a power of attorney. Recommendations?

Adult Protective Services contacted the Probate Court/Register of Deeds office in mthr's county when they were trying to find out if there was anyone who was legally responsible for her. Apparently in some states, this is the method used to establish legal POA or to at least put it in process. I know that once she signed her POA, our atty had it registered at the courthouse, and the official copy we have to use with selling properties has the registration page and signature on it.

Ask your mother. If she can't remember, ask her attorney. Most states do not require a POA to be filed with the county clerk. Nor does the POA have to show it to you, they only show it to financial / medical institutions.