Your wife will have to sue the bank seeking a court order requiring them to honor the POA and the transactions under it. Only a court can resolve this dispute and has the power to order the bank to do something. The suit would be brought in county court, in what was traditionally called the "chancery" division, though not all states still call part of their court system "chancery." The action can be brought on a "emergent" (think: urgent or emergency) basis to get into court faster. Bringing lawsuits for court orders is more complex than bringing one for money only, and filing it on an emergent basis adds to the complexity: your wife is advised to retain an attorney to help her.