Maybe I'll Come Home in the Spring(1971)

Overview:

Dennie has returned from a year among the hippies to her superficial, image-conscious suburban family. She must face their disapproval of her actions. They refuse to even try to understand. She must also deal with an ex-lover, and a beloved young sister who is following in her footsteps, wanting the idealistic hippie life but making some rash decisions in the process.