My son has never really been in regular habit of sleeping in my bed but once every couple months he will have a small section in time where he feels he needs to be there, he uses every excuse possible to get to sleep in my room, nightmares, scary noises, etc, being a single mom it's harder to say no because I'm alone in my bed. To try to soothe him I have found that I can go in his room and lay with him, I always read him a book or two of his choice before he goes to sleep to start calming him down, sometimes he has a movie on, other times with music and once he falls asleep he's good. He also it a sucker for drinking a little bit of milk before bed to, seems to help him fall asleep. Also in the beginning when I made the switch from his crib to a bed he was really hesitant. Try making it fun, buying new "sheets" with the character of her choice or a new BIG stuff animal for her to cuddle with, something that may make staying in her "big girl" bed exciting. I also put on music or tv for my son to try to drown out the "scary" noises he says he can hear at night, he also has a very 'festive' nightlight in his room that he loves to turn on and it makes shapes on his ceiling, sometimes just watching that will make him fall asleep. I hope this helps. Feel free to ask any questions if you have any!! Good Luck!