Questions about transition from public to private.

My daughter is currently enrolled in a public school but will be switching to a private school next year. She's not making this change at a standard entry year, such as kindergarten or middle school. What kind of transitional issues should I be aware of, and what questions should I ask of her new school before she begins in September? I'd love to hear from other parents who have transitioned from public to private about their experiences and any suggestions they may have about making this a smooth change. What do you wish you had known, and how do you suggest I prepare? We're very excited to be joining this new school and want to do what we can to have a wonderful experience from the start. Thanks, parents!