N.P.
I felt the same way when my friends started to pull in that direction. I tried on many hats while growing up and your daughter will too. When high school rolled around I fell back into myself and admitted that I still clap for Tinkerbell. I found a group of kindred spirits in the theater, and though I did not like getting up on stage myself, I was always there to help out for every production and enjoyed making the magic of the stage come to life. I loved building the world where the players would tell their stories.
The best advice I could give you to pass along to her is to remind her that with each new day she has the opportunity to reinvent herself and on days where she feels downtrodden in a world that doesn't seem built for her, let her know that there is a place for her and she'll most definitely find it. She doesn't need a whole stable of friends to worship and adore her, she only needs to find one or two who share her interests and she'll be as happy as if she had twenty. If she finds herself upset because a group of girls don't like her, remind her of all the people who do like her.
She is going to get hurt. The world is a crashing sea for the lone boat trying to sail against the current, but as long as she stays true to herself she'll be just fine. And even if she doesn't make a single friend at her new school, as long as she has an active imagination and a good library of books, she'll never be friendless. I've spent many lovely hours lost in my own head and don't feel any worse for the journey.
I grew up, found the love of my life, got married and had a beautiful little girl who is turning out to be nothing like me... but that too is an adventure.