Is it possible that she could have been attracted to women, and Joe couldn’t handle that, and had her brains scrambled?
He never could allow anything like that to be associated with the family.
Well, the specific story I remember is when Adolph's pals, Joe & Co. were at the Court of St. James, Rosemary was having a fling with a chauffeur/driver, that was what set off finding a "solution" to Rosemary.
Beyond that, I haven't the slightest clue.