Request #412 From Mary

I read this book in the 1960s.  It is a teen book about a girl who has very long hair.  The girl is not popular at school.  Every day after school her mother would serve tea to her.  This girl is going to go to a summer camp as a counselor.  On her trip there she has her hair cut. Her hair now has a wave in it.  At the camp she finally finds acceptance as a person.  I would love to know the title and author.  I can’t stand remember either one.