Use the mage spell haste! It will give your fighters a better chance against her. Don't be afraid to use summons.
A really nice thing that happened to me ages ago was that my cleric had a flail or hammer of stunning.... And guess what? She got stunned! It was only for a few seconds, but it was more than enough time for my party to swarm her (I only had a paladin, mage and a cleric/thief).
Good Luck, and beware all the icky traps in the passages.
Cheers,
Moiraine Sedai
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~The wheel weaves as the wheel wills~
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