Hi!
Everyone is on the right track with the actual packing info...labeling properly is key, but I would like to address your little one! I moved with my two year old when I was 8 months pregnant with my 2nd daughter, so I have some experience with this! Not only was I prego, but she went from a crib at her old house to a toddler bed at the new one! We had a lot of changes going on in a very short time, but had no problems as a result of how we chose to handle the situation.
The most important thing you can do is talk to your daughter. Let her know EXACTLY what is going to happen and when it is going to happen. You could even start a countdown calendar and have a small daily task for her to "help" you with so the move will be easier. I would also put an empty box in her room so she gets used to seeing them. She can play with it for awhile and then slowly start filling it as the move approaches. She will think it is cool to be a big girl helper, too!
Emily was really curious about everything we were doing when we were preparing to move, so we just told her what we were doing. I think we as parents make it a bigger deal than it actually ends up being. As long as you stay calm, she will, too. Kids will pick up on whatever you decide to emote, so even if you are freaking out on the inside and your to-do list is a mile long, make sure you take time out to answer her questions and read the book she brings you when you are in the middle of chaos. It will make you life a lot easier!
As soon as you get access to your new place, even if it is only a few days before you move...go there! Take her to the new place and show it to her empty. Seeing it ahead of time is helpful because then you can spend the next few days answering any questions she has so that when you actually get there, it is familiar. You can take pictures, too and print them out so she can get used to it. Once all of her things are there it will feel more like home, but the familiarity will be there before that, too. Does that make sense?
Moving is tough no matter how old you are. Just remember to keep a cool appearance and if you have family over to help you pack, make sure everyone knows to include your daughter so she doesn’t feel left out of the process. GOOD LUCK!