I would say use some distance weapons. The theif could be nailin her with bow or crossbow. Then cycle your characters through, have the fighters and Paladin attack and then as one is hurt have them come out and heal them, then send them back. Perhaps you could use your Ranger as the archer? I usually have at least one Archer(thief) and one mage, a cleric and the rest fighter types. That usually works for me.
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The line between good and evil is a razor sharp thing. Be careful of misteps,
as you may find yourself spitted upon your own blade.
[This message has been edited by Wulfere (edited 06-25-2001).]