I saw a TV movie in the late 60's early 70's about a young girl's decline into drug abuse. The actress had long curly light blond hair - very hippy looking. In the end she ended up in a coma from drug abuse.

Was it Go Ask Alice (TV Movie 1973) - IMDb (http://www.imdb.com/title/tt0068644/?ref_=fn_al_tt_1)