Yep. MGM was providing her with amphetamines for weight control and sleeping pills to counter-act the uppers for years. She will turn 21 on June 22, 1943, so it seems her child-star years are being artificially prolonged.
I believe “Valley of the Dolls” was intended as a portrayal of Judy Garland’s life. Rumor also has it that she “got around” Hollywood...if you know what I mean.