"Sweetheart!" says Marilyn, concerned, and Olivia starts to flip out, because she is not this woman's daughter, this is not her home, this was supposed to be her way home. She starts yelling about how her home is in Jacksonville and she's never been here before, and her mom, a little anger mixing it with the worry, snaps, "If you've never been here, how did you know to come here?" Hee. Any second now she's going to refer to Olivia by her full name and order her to march her butt upstairs to her room.
Anyway, Olivia doesn't have any response to that, and she glances around. "I helped you paint, didn't I?" Her mom, relieved, says yes, that she wanted blue but Olivia picked the colour: "Yellow, because it was more cheerful," says Olivia. They hug again, and Marilyn says, "Sweetheart, this is your home. This is your safe house," which is kind of an odd term for a mom to use, unless her last name is Gambino or Gotti or something.
They hug for about eleven hours, and eventually alt-Charlie comes knocking on the door and asks Marilyn if she's heard from Olivia. "She's here," says Marilyn. Charlie's surprised. Going home early tonight, Charlie! Marilyn invites him in, and Olivia's sitting on the sofa in the living room, looking out the window. She looks at Charlie and smiles, a little unsurely. "Hey," she says. Count me in the camp who thinks that, although Fauxlivia's memories are clearly bleeding into Olivia's own, she knows what's going on and is playing along.
Anyway, back in Walternate's office, the secretary is praising Brandon, who seems none the worse for wear save for a bandage on his hand, for the treatments, which just appear to have needed a little bit more time than Brandon'd assumed. But Brandon says it was the adrenalin from her escape that triggered the memory B-lymphocytes. "It carried them across the blood-brain barrier and successfully transferred the memories, which means for all intents and purposes, she is our Olivia now." Sounds kind of like when you get a new computer and use a Firewire to transfer all your old files, only much easier.
While he explains this, we watch Olivia looking around from the passenger seat of alt-Charlie's car as he says goodbye to Marilyn. Can't definitively say that she knows what she's doing. Anyway, they drive off, and nearby we see 'Enry 'Iggins in his cab, watching them leave. He puts the car in drive and starts moving, but turns left instead of following them.