[ After last night and talking to Damon about going home (feeling like a part of her doesn't want to), after everything that's happened at home, and here, everything -- Elena came to this party to actually take some load off. (Plus Caroline's involved, and where Caroline's involved, Elena will always be for support.)
So: seeing Rebekah isn't a surprise, and and it was definitely a possibility. Elena's eyes only glance at the other girl -- linger only a moment to see her, feel the emptiness she wishes she could regret (or wishes she didn't), and take in Bek's state of dress.
Obviously, no matter what words were exchanged or what truce has been put in place, the tension between them isn't about to just dissipate.
And neither are their mean girl political campaigns, she supposes.
Elena exhales, pops another grape in her mouth. So casual and having no cares. (If that was supposed to press a button, maybe it would have worked better if she hadn't embraced the costume and all its implications to herself much earlier and then to Eric.
But that's not to say it didn't work at all.
This is the girl she stabbed in the back. Literally.) ]