Caught that one some years ago
and if it's the one with huge letters "EDIE!!!" on the front cover (over the head shot with the page boy haircut, I think), then we read the same bio. Didn't have as much on the Velvet Underground as I was looking for, but roped me into the ups and downs of Sedgwick's 'youthquaker' modeling career quickly.
Later, there was a film about her made called "Ciao Manhattan" consisting partly of documentary footage of her early shoots, then live footage of her in autobiographical scenes, featuring an insanely overdone implant job... this book and that movie are the only two bio pieces I know of about this intriguing personality.
Continuing the "fall from fame" theme, I think there's a similar body of knowledge (books, a film somewhere) about Nico.