How about...
Redistribute your points with the SaveEditor. Put five points into Blind.
Cast it on Josephina before she gets the chance to cast anything on you. Proceed to hellspike her to death. (Great gawd, the first hit really does matter. I had a hard time taking her down when I had to recruit Bronthion to join the Council because I let her cast her shield, summon her knight, etc. The second time - in the Black Ring dungeon - she was a piece of cake.)
