For all her normal self-assurance, the idea that Stefan would be spending however long the glitch lasts in such close proximity to Elena makes something twist inside Katherine - something that smacks distinctly of not only jealousy, but also uncertainty. Does he still love Elena? Katherine knows he still cares for the doppelgänger. It's Stefan, it's what he does. And that's exactly what concerns the older vampire. She loves both brothers, but if she had to, she would have no problems discarding (in whatever capacity - even permanent death) Damon from her life. It would always be Stefan for her. One part of Katherine suspects Stefan wouldn't be able to do the same with Elena, make such a distinct, permanent choice. But Stefan has pledged his love for her, chosen her and not her doppelgänger, hasn't he? This prickle of doubt is ridiculous, wasn't it?

Were this a private conversation, Katherine might actually push the issue, but it isn't and she won't. Not with Elena right there.

"Well, I'm sorry if I'm less than thrilled about this turn of events," she manages grudgingly, sounding slightly less spiteful in response to Stefan's pleading tone.