You can try calling the attorney, but you should find out for sure if your husband signed anything first. You may want to have him sign something that says he did not give her a POA and that she is not authorized to act on his behalf.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive legal consultation and review of all the facts and documents at issue. This answer does not constitute an attorney-client relationship.
You can first check with the Pierce County Auditor, public records and see if there is a recorded Power of Attorney. It is unlikely that an attorney would notarize or allow someone else to notarize a Power of Attorney. You can also have your husband sign a revocation of power of attorney that would revoke all powers of attorney he may have given. The revocation should be recorded with the Pierce County Auditor. I do not think that calling the attorney is a good idea. You should consider contacting the Tacoma-Pierce County bar association so that you can discuss your situation with an attorney.