[ As a friend of both Connor and Ethan (and Lily, who may not live here, but it's her party as much as the boys), Elena showed up. She's not exactly what you call a party gal, though she had been in the past, and while she's had fun, she's also thinking of calling it a night soon.
She wants to at least say hi to Logan before she leaves, since he's the only one she hasn't spotted out of everyone that's shown up for the celebration.
Elena knocks on the door of the library and pokes her head in. ]