@Buffalobiian:
Sadly I do not see Kallen wearing her school uniform again (and she looked hot...)
As Ryl pointed out... she is indeed in deep shit with Britannians.

But one thing... she wasn't working there as many assummed (from previews, etc). Nor she was enslaved... she entered there to approach Lelouch. At least that is my theory

@BladeChild:
Yep. Mentioned before.