His estate is releasing an album in 2010 of MP and JP songs (I have a feeling that it will have very, very, very poor sales):
http://www.contactmusic.com/news.nsf/story/john-mackenzie-phillips-album-to-be-released_1117042
A song he wrote about her from his first solo album:
"She's Just 14" Lyrics
She's just 14 - little movie star queen
There isn't much she hasn't seen
She "did it" in a limousine car
She dated pop stars
Hey Rainbow Hair, say that's no where
But she always says
I'm just a sexy trash can
But she's just a little girl, who thinks like a man
And sometimes her Daddy's spoiled her
Sometimes he treated her rough
Sometimes she's gentle
Sometimes she's tough
But she is always too nice to the driver
She says James have you had your supper
And she's always too high on arrival
And she runs on her high platform heels
And she falls flat on her face and she knows how life feels
She got the moves, yeah she got looks
She got the style, she's read all the books
And nobody got her on her hooks
She's on a real smooth trip, yes a real smooth trip
She's always too nice to the driver
She says James have you had your supper
And she's always too high on arrival
And she runs on her high platform heels
And she falls flat on her face and she knows how life feels
I see her sipping her Thunderbird wine
Wonderin' if she's the last word in space and time
And she knows she is, She's so pleased to discover
She's so hip. She's on a smooth trip.
Well she's always too nice to the driver
She says James have you had your supper
And she's always too high on arrival
And she runs on her high platform heels
And she falls flat on her face and she knows how life feels