Tnkrbelle, here is my advice and I'm a hardcore mommy who never gives in. Never! I know, I'm mean!

(I will admit sometimes I say no when I wish I would have said yes, but it's too late, I've already said no, so I stick with it, minimizes whining for things big time b/c he knows I won't change my mind)
How much effort are you willing to put in to correct this? This is a battle of wills! You must battle! It's the only way. No more bribes, no more sticker charts! Have what I like to call a "come to Jesus" talk with her.
"Listen, Susie, I know you like sleeping in Mommy's bed sometimes, but it is over. You are a big girl and you are going to sleep in your own room. If you would like a radio with some music, or a night light that's fine, but you are not coming in my room. Do not bother to try to come in my room tonight. If you do you are going right back into your room. There will be no more Disney money, no more stickers. This is it. I love you and I want you to be a big girl and big girls enjoy their own rooms. Sleeping with Mommy is for babies."
Ok, now you MUST FOLLOW THROUGH, REGARDLESS OF HOW FRUSTRATED OR TIRED YOU ARE. She comes in your room, you walk her back to hers. She comes in again, you walk her back to hers. This could go on for awhile, but you must PERSEVERE. After awhile she will learn she is getting nowhere.
Consistency baby consistency! I know you can do it. You just have to be willing to suffer a bit to get it done. You are the parent! She is not in charge! No relenting! None! Now go into battle and prosper...oh and tell us how it goes. This could take awhile, but you are tough!
Dcforbreakfast out.