I can only say that I was given very specific & authoratative information that Car On A Hill is also about Glenn. The song comes from 1974, the same album as Help Me, not from 1972.
And the song's lyrics hardly suggest a suicide attempt as claimed in the link.
Jackson's attention to Phyllis Major felt, to Joni, like "a great loss and a great mind-fuck," says her confidante. One night Joni was at her apartment on that hilly street, expecting Jackson to come over. He didn't show up.
Jackson's attention to Phyllis Major felt, to Joni, like "a great loss and a great mind-fuck."
What happened next Joni has described to several people as her "suicide attempt." One confidante says she said she "took pills. She cut herself up and threw herself against a wall and got completely bloodied - glass broke. She vomited up the pills." According to one confidante, David Geffen came to her rescue and got her medical help. Joni wrote a song, Car On A Hill, about that evening.
After the incident, "She went to a 'think tank' for therapists" in a residential setting, the confidante says, "and the head guy said to pick the [therapist] you want to work with." Joni Mitchell wrote Trouble Child about this experience.
And just from that she says the song is about Jackson Browne?