Maria was there with Kayne, Wallace, and Izabela Popa, primarily buffing. The only blasting she did was when they had to run away from the Khan the first time, and I think she only summoned five helm horrors for support the whole dungeon.
I'm not sure why there's so much resistance to the idea of balanced parties. Maria and Kayne, a witch, and a witch hating barbarian, were in a dungeon together, for entirely in character reasons. It made for some great roleplay, especially the reactions of all three to some of Maria's new quirks.
If we had a mid level cleric with us, just for the AC buffs and healing, it would have been better, and a bard would have been a bonus.
Bear in mind it is a high level dungeon, so a balanced party is going to have an easier time than a one dimensional party.
As an example, the best silver mine trip I was ever on had one bard, one cleric, one druid, two (or three, I can't remember) fighters, one wizard, and one sorc. A balanced party is a beautiful thing.