My daughter is starting a new school and she is a train wreck! Any suggestions to help ease her worry?

My kids do this every year even at their current school. They tried on a thousand and 2 outfits before the first day of school and they changed their hair twice before school. It was awful. After the first day, she'll be fine. Girls are so spazzy, I swear. Is there anything new you could get her to boost her confidence? Like a hair straightener or highlights or something? I don't know her age, so highlights might be a bit much.