Form here on out, you have to be strict with her and tell her that she has no choice but to sleep in her room. Tell her that all of her friends sleep in their own rooms and if she wants to be a big girl, she needs to start sleeping in her room. Maybe if you use a reward system with her for a while, it' might make a difference. After every night she sleeps in her room by herself for about a week, give her a treat or something she likes. Then as the weeks go on, extend the nights into multiples before treats are given. After a while she should be sleeping in her room willingly. When she realizes that there's nothing to it, you should have no more problems. Be strict about it though. Hold your grounds. Be firm. Does she ever spend nights outside your home like at a grandparents or aunts or uncles? Friends houses? How is she at these other places? Once we start letting our children sleep with us, it is hard to break as a habit. They need to be independent. However, maybe as a fun sleepover night on a weekend, it doesn't hurt to have a camp out or two. Watching movies in the living room,den ,bedroom,etc. My kids and I do this once in a while when I think they've earned it. Or I'll allow them to have camp outs in each others rooms once in a while. But this has to be a earned activity. Is your daughter independent? Keep telling her that all of her friends are independent and all are big girls and boys, Keep positive about it and keep strong. Good luck.
good luck my girlfriend has a 13 yr old son that still sleeps with her and refuses to go to his own room i blame it on her she lets him do it and does nothing about it believe me it cuts into our time alone but what can i do shes got her place and ive got mine the only time we get to be together is when hes in school so like i said good luck