Books were a craze when I was a kid (especially for me).
Here are the girls I grew up with:
Jessica and Elizabeth Wakefield in Sweet Valley High (my sisters and I even had the board game)
Jessie and Violet (with their brothers) in The Boxcar Children
Ashleigh in Thoroughbred (Katie and I fought over these)
Laura and Mary in Little House on the Prairie (and the TV series too)
I know I read others- but these were my staples.
What girls did you grow up with?