Green’s Dictionary of Slang

(drugs) a young female drug taker or heroin addict.

1954		M. Rubin ‘Gold Ring’ in Margulies Back Alley Jungle (1963) 96: The girls organized too and branded themselves the ‘Junkettes’.
2002		R. Guskind Cherry Bleeds 🌐 Sal, my Brooklyn junkie friend, is sitting on the passenger side. And, Karen, a bank loan officer from Westchester and fairly cute junkette, is sandwiched between us.