Dear LB,
We moved in the middle of the year when my son was in 4th grade. Fortunately, we only moved across town and they let my son finish the year out in his old school. When September came it wasnt any easier than if we would have moved him mid year. He was nervous about making new friends, liking his teachers, etc... but he made a new friend the first day and he actually made some better friends in the new school.
I dont know how far you are moving from where you are now, but if it is possible you should try to make arrangements to have your daughters friends over on the weekends. She will be excited to show off her new room, etc. and it will give her something to look forward to all week long.
Kids seem to adapt way faster than us adults so I wouldnt be too worried. Just make sure you also talk to her about how she is feeling, all throughout the process.
I hope everything goes well. Good Luck in your new place.
Keep me posted :)!
~ Cyn