S.A.
for my son we decorated his bed with his favorite character NEMO! Does she have a favorite character? I have to lie next to his bed for him to fall asleep (his bed is too small for me to get in-which is a good thing)
place some soft classical music. or read to her before bed time, start explaining that she is a big girl and this is her big girl bed
I used to watch this little girl who would get up late at night (she loved anything princess) so I told her, if she wanted to be a princess that she had to sleep in her princess bed and princess' need their beauty sleep! it worked! LOL
good luck