The Substitute Spanish Prisoner (aka Dr. Peggy Hill)

Peggy takes an online I.Q. test sponsored by the "Intelligence Institute of Texas," and is declared a genius.  When the head of the Institute, Dr. Vayzosa, offers her a chance to get a PhD for only $900, she uses the family savings to pay for it.  When Luanne takes the online I.Q. test and also scores as a genius, Peggy realizes that she has been conned, and she comes up with an elaborate sting to get the money back.  Hank learns of her plans, and tries to intervene, but is it too late?