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[ The question makes her pause, miss a step in the conversation. She's not sure why Kitty's asking, but Elena acknowledges she hasn't told Damon about joining the Defense Force yet - and not even because he'd have a fit of a reaction. (That's all the more reason why she would tell him - because he can't think he has the right to boss her around.)
He doesn't know because Caroline showed up, and it seemed more important to deal with that before any other responsibility, before Damon having a reaction.
She'd only been using the headquarters to train before all this anyway.
But she recovers from her surprise, her expression turning wry and full of challenging resolve. ]