Most relatives of bulimics don't catch on to the bulimic behavior for years. Bulimics can be pretty crafty about hiding their disorder. I do believe she had some kind of eating disorder.
I do find it ironic that she was starved to death, however.
So her parents didn't know she was bulimic, her husband didn't know it either, or her friends, but the author of this piece of crap does??
And as Christine Hoff Sommers has pointed out in her books, bulimia death figures in the U.S. are completely cooked by politically correct feminists and their statisticians. Read Joyce Maynard's memoir "At Home in the World" (or Jane Fonda's new book) and see how she spent most of her life as a bulimic - without managing to drop dead of a heart attack.