My daughter is really upset about changing schools how can i cheer her up?

my daughter was having trouble at her old school and kept asking me to send her to this other one, now that she is enrolled she is crying constantly because her best friend is at her old school, she is also unhappy with the uni from and wont settle for it to be long, i hate to see her like this and i just want her to be happy so if i could have any help it would be greatly appreciated.