I found it too low for myself at levels 14 and 15. I summoned elementals, had superman cast on my fighters, the bard was casting heal all, my bishops were casting defensive spells (bless, soul shield, element shield, eye for eye, armour melt etc) and after 22 round I barely did 150 points of damage. So at that rate it would have taken me over 100 rounds to beat her. I'm not saying its impossible but luck really helps. Oh, and my valkyrie got swallowed around round 10 which didn't help any. I also had everyone equiped with weapons that had the highest ko and kill % I could but it didn't make a difference.
Good luck.
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