She will do fine once you all get settled in. It might take a month or two of adjusting but she will be ok. Don't play it up to the hilt just let her know that her things will be there. Make sure her room is one of the first that you unpack and let her explore the rest of the house.
When I first moved my son he was about 3 and got a bit homesick but we moved from Tucson, AZ to Quebec, Canada. It took him about three months to realize that he was home. I pointed out that all of his toys were there in the room and that it was fine. We even called a former neighbor up and talked with him and his mom. After that he was okay. Kids bounce back from moves better than adults.
After that move we moved from Quebec, to Las Vegas, NV, to Germany and moved 3 times in Germany back to the states to New Mexico. The hardest move was the last. Our son had just graduated high school and daughter was in junior high. We all found our boundaries of the town in a short time.
You will all be fine. Just do things together so that she becomes familiar with the new house quickly.
The other S.