I haven't been in this spot, but have talked about the possibility of homeschooling with DC, and have found that they worry about things, too.
Can you get your DD a shadow day at the new school to ease her concerns?
Also, how permanent is the choice? If your DD doesn't like the new school, can she go back? If she could go back, would it have to be at the beginning of the following school year, or would mid-year be possible? If going back is possible, I'd lay all that out with her to explain, and to set up kind of checkpoints for how it's going and the manner in which you'd decide how to proceed next.
Whether or not going back to the old school is an option, have you sat down with your DD to list your and her pros and cons of each school? Change can be scary for all of us, and sometimes the familiar seems a lot better just because it's comfortable. If you can remind DD of what she hasn't liked about the current situation, and how you expect that to change in the new situation, maybe that will help.
Good luck! Sounds like an exciting time for you and your DD!
