And also she would like floral...

That image would be a great starting point.

You might start with having her define vintage. Have a 17y niece that had the same idea but with fusha and aqua. Her mother and I struggled for a couple of weeks as the "rules" were that it had to be done by her birthday and everything had to be on sale or garage sale finds. Imagine our shock when on a morning of garage sale shopping with her we learned that her "vintage" was 70s style. We easily finished with my niece as the lead shopper

Remembering in the end, style is a point of view we find personally pleasing. The teen years are full of experimenting with defining who we are as individuals in many ways. All in the comforter of our family who know and accept us with love.

Have fun and experiment with your teen!