I always only run one mage ( she rocks ), a fighter ( lonewolfed so party of 3 at most) and a Rogue ( Bairdotr or Wolgraff preferably Wolgraff).
I have never even cast a touch spell since I wasnt figuring being in the proximity of enemies was going to be super healthy.
I am curious about how you use her:
I would like to see her in action, is her init high enough to be first every turn and does she have enough AP to run up and start touching the enemy? Can she usually touch more than one enemy per turn? What escape and evasion tactics/skills are you using most and how?