Meg, the Secret Life of an Awakening Girl by Theodora Keogh

Sublimated lesbianism in a very young girl.
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The initiation rites of a slum gang... the awakening beauty of spring's first morning.... Prostitute, pimp, poison-eater. Every New York street offers exciting adventure; every encounter is a new experience for Meg. Very soon she will become a New York debutante. But now she is learning about a different world and her afternoon adventures are far afield from her wealthy home or her select, expensive school... This unusual novel bares the secret life of a care-free adolescent whose uninhibited curiosity leads her into the adult world--a world of quicksilver passion and violent emotions where only a child can survive unscathed.