We also went through it with our kids, several times. Our first international move, from the U.S. to Peru, was when our oldest was 3.5 and our second had just turned 2. Then we moved from Peru back to the U.S. four years later, with a third child who'd been born in Peru and was just shy of 2 years old at the time of the move. In the 11 years since, we've had several other international moves and one more child.
The biggest thing, like Stilltorik has said, is to communicate with your child, a lot. Talk to her about what is going to be happening, and what it is going to be like.
But I want to add a couple of things - first, tell her as much as you can about her new location, without creating expectations that you may not be able to deliver on. We actually were in communication with several people where we were going to move and they sent us pictures. One family was going to be our next door neighbors and had a son the same age as our four year old. We talked to her about the new friends she would be making, and how she would get to start school with this new friend. She was actually very excited about the move. If you can start communication with a family with children, at your new location, that will be really helpful. Our second child really did not seem to grasp at all what we were trying to communicate to him, but we were not worried at the time (later we would find he had a severe form of autism).
The second thing that I would encourage you to do is to give your child some decision making, let her feel that she has some control in this. Allow her to select what she wants to take with her on the move. Our daughter had a lot of stuffed animals, so she got to select which ones to take (basically she chose all of them, and that was fine).
Also make a big deal of taking things that make your home a home, your home. Pictures, wall hangings, quilts. If there are special lamps, decorations, or portraits in her bedroom, take those with you. Even put as much of them in the stuff that you carry with you, rather than shipping it. Make sure that when you get there, these are the first things that you put in place, even within the first couple of hours in your new home, right away, make it yours. This will give a needed sense of continuity not only to your child, but also to you as well.
My last word is that kids are supremely adaptable. Their brains are wired for new stuff, because everything is new. The move will be harder on you than on her, but your tension and stress will communicate to her, so take good care of yourself. Give yourself plenty of time to settle well into your new home. If you can avoid it, do not work for at least the first week in your new location. But if you must work, make sure that you have plenty of rest and family time at home. At the very least, make sure that you all sit down for family meals every day.
The togetherness of your family is the biggest factor that will carry all of you through the changes. As we have taught our kids, friends move away, they come and go, and sometimes we are the ones that move away, but family stays together. We are each other's best friends, and if we must move, we move together.
