Answer:
Although Flo founded the group and sang the lead on some of its early songs, she was forced out as leader and as lead singer and was then fired from the group entirely. She died of a heart attack in 1976 shortly after getting off welfare. For the full story, see The Lost Supreme: The Life of Dreamgirl Florence Ballard, by Peter Benjaminson, available on Amazon.com and through thelostsupreme.com Also be sure to see the upcoming Flo Bio Pic starring Faith Evans.