Aside from trading it to the Elder Brain, I believe you can also elect to simply keep it for yourself.
What do you mean by the "grand room"? The room that the Elder Brain is in? Did you go there first and make the deal before retrieving the mirror? I always got the mirror first.
I suppose that if you've already made the deal, then perhaps you need to talk to one of the other Illithids hanging around in Brainville? I seem to recall that there's one named Ulitharid, in particular, who guards the way down to the Elder Brain, perhaps you need to talk to him? It's the best idea I can come up with.
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