I'm at a total loss. Here's what I'm dealing with;

Prior to DD2 being born, E was sleeping like a dream. We would tuck her in, day goodnight, walk out and she would fall asleep by herself.

Night 2 of DD getting home, E starts getting out of her toddler bed for the first time ever. She begins insisting we lay with her to fall asleep. After 3 months we finally get back to normal but only for a short time.

Today, E will go to sleep by herself but wakes up around midnight and insists on sleeping in my bed with me. I've tried the super nanny method of just picking her up and putting her back in her bed but it doesn't work. We literally did it for 2 hours last night and because she shares a room with the baby it's obviously becoming quite a problem.

What should I do?!