J.P.
I think at this point she is definately in the habit of getting in bed with you which means it will be hard to break. The scared thing could be just an excuse but just keep reassuring her that shadows are just from all of the wonderful beautiful things in her room. Maybe tell her that nothing bad can get to her when she is in your house and, ask her if she hears noises and if so, that any noises outside are just the beautiful trees or the wonderful wind or anything you think of that will comfort her. But most of all I think it's important that you calmly but firmly take her back to bed everytime she gets in your bed and keep rewarding her for staying in bed. But just don't let her stay in your bed. This could take many times to break the habit but it is necessary to break the cycle. Be consistent and patient. Good luck.