Elijah asks if she wants to work on his mind palace with him, and she agrees. She's aware she is closer to Elijah than most could ever be, she's in his mind after all, but the same rings true for her. She wants to see more of his mind palace, it's a peek into his mind that very few will ever see.
She's helping him organize when they hear Caroline ask Elijah to leave again, for another hour. They've made good progress, and are at a good stopping place, Elijah tells her. They carefully move back into Elena's head, and he asks if she wants to watch a movie when he returns. He feels presumptuous for assuming she'd want Caroline to leave, and that she'd want him to come back, but she smiles and agrees to it.
He tells her he'll see her soon and lets her send him out.
There's a few minutes of silence as she waits for Caroline to enter her mind, so she plays music and walks to the front door. It doesn't take too long for her to catch sight of a flash of blonde hair.
Caroline tells her everything, about the absolute perfection of the date and updates Elena on everything she can think of, including Rebekah and Kol's betting habits. She reminds Elena that there's four days until Alaric, Jeremy and Bonnie come and Elena asks her to make sure they feel welcome. She can't do anything while stuck in her mind, she has a feeling after their visit is over, she'll be exhausted. That's at least four people in her head, hopefully Elijah won't let her get overloaded. They all have to enter her mind separately, she doesn't think she can handle more than that. Regardless of the spell, she doesn't think she's mentally capable of sharing her mind palace with more than one person.
Caroline nods and talks about scheduling, which she'll be on top of, and then yawns and tells Elena goodnight. Elena says goodnight as well, despite the fact she won't be sleeping and sends Caroline out of her mind.
She moves to the front door to wait for Elijah.