Your daughter sounds just like me at this age and it took me a really long time to get over it :( My younger brother was born when I was just 3 and until I was well over 6, I was waking up like that on many nites and going to my parent's room. In hindsight, I just needed extra comfort due to lots of jealousy over my baby brother. My parents didn't handle it well and they just made me go back to bed and were really annoyed - they eventually started locking their bedroom door at nite and I would sleep on the floor outside their room.
As a parent myself, I can see the source of my parent's annoyance. However, based on my own experience, I've taken the approach with my own kids that if they need us at nite, we're there for them. One of my sons had alot of difficulty in this area and in the end, we brought a twin bed into our room and placed it next to our bed - he never woke up at nite with that approach because he had the security of knowing we were there. In the end, the quality of my sleep improved because I wasn't having to lay by him at nite to fall asleep and falling asleep myself and then waking up with a sore neck at 2am.
I realize that this isn't the sort of information you were looking for, it's just having had the same experience myself as a child, I can feel your daughter's pain. So, I will try some (untried) suggestions that might work. Will her room be any closer physically to your own after the move? Unfortunately, the move itself (I had many of those as a military brat) will likely also be traumatic and may also increase her need to be with you. So, if you can try to let her know ahead of time that you're making plans to make sure she's as close as possible to you at nite, she might transition better. I would even go so far as to suggest that you put a sleeping bag on the floor in your room and letting her know that if she awakens at nite and feels the need to be close, she should come to your room, get a hug and then lay on her sleeping bag. She may just need to know that it's okay to still need you at nite. If you give her some control in the situation, I think that will really help her deal with it better.
You mention you've dealt with food issues, so I'm assuming you've tried removing dairy and/or gluten. I didn't find out until I was much older that those were issues for me, but they may have impacted my nightmares and the need for comfort at nite. And, I also later learned that my own sons had the same issue, thus that might also have contributed to their needing me at nite.
Good luck!