You only need to do the battle squares enough to get the key to Oria's room; the rest is optional and has no effect here.
It's been quite some time now and all the details are a little vague in my mind. I do know that when the levers are pulled correctly, the party becomes ethereal as she is, and you should be able to attack her in the usual manner. If that isn't happening, then some other step may be missing. Does your team become ethereal? If not, you may need to pull another of the control levers after getting the "inner sanctum selected" message.
Nightowl2
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