Solo warlock can take her down with fire shaper ring, LOH, bear strength, and Gauntlets easy.... Add a battle fury to that and the warlock can do 18 attack dice in a hurry, and with the burns it gets ugly quick. Shoot her with gorgon archers and she has no attack power from the weak condition. Keep her away with push or give the archers indirect and hide them behind a wall if you have to. Have the beastmaster summon six Darkfenne bats by turn four and rot her to death. play mana syphon and some mana leaches or a drain power and she will have no mana for her upkeep. Play decoy to counter her nullifys (or nullify her nullify). Im not trying to being a jerk or anything, just the first thoughts from the top of my head. She is good, but I wouldnt say unbalanced.