I'm not sure of the level that Aerie needs to affect the undead here, but if you are doing this quest near the beginning of the game then more than likely she won't affect more than the zombies. Keep in mind that if you do anything with her but move her turn undead ability will shut off.
Since you said you've already completed this quest you probably don't need this, but if you'd like an easy way to handle this quest the next time you play then try this:
SPOILER
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Get a few Protection from Undead scrolls for your warriors and then they can go in advance and slaughter almost every undead creature in the place with no resistance. Then the only two problems you'll encounter are the traps and the vampire's mind control (if you put someone in the lead with Lilarcor, then the vamp will key on him and can then be taken out).
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