This is my theory on how Elena will exit the VD. Okay I think Elena will say her goodbyes, she'll tell Damon and Stefan that they were the epic loves of her life but now she has to find her own way, she'll hug both Bonnie and Caroline and tell them both that they were never just her friends, but they were like her sisters. that she loves them more than words could ever explain. She would hug and kiss Matt and Alaric and tell them that they are the reason she has survived for so long, even when she wanted to lay down and die. She's turn to Jo, rub her belly and say, welcome to our crazy, ass family and hug her as well.
She gets into her car and is driving down the road, she goes over the bridge and stops as someone is waiting for her. Elena smiles, the person gets into the car. Elena pulls over at a motel, she changes into tight leather pants, heels, a white tank and a black leather jacket, and curls her hair. SHE'S KATHERINE!
( A voice over reads, "They really thought thye were rid of me didn't they?, I told you all before Katherine Pierce will not go down quietly. After being pulled away from the church, I too was trapped in the 1994 prison world, were I passengered my self into Sexy, little Kai, and made my way out, oh and when he was merging with his brother, i jumped into Jo, then I found my way back to pretty little Elena, (laughs) She's gone now, but I'm here, with other matters to attend to, I was also in Bon-Bon and managed to suck up all of Qetsiyah's magic making me uber powerful, get ready Klaus, I'm on my way(It shows the other person in the car is Nadia)
(She's on the road, a sign says "Welcome to New Orleans")"Let the good times roll"