Well, given that she is scoring these lead roles in musical productions, I don’t think she is necessarily the falling-apart type of student you described.
Lindsay Lohan, Robert Downey Jr., Amanda Bynes, Corey Haim, Corey Feldman, the kids on Diff’rent Strokes, Jodie Sweetin, Britney Spears, Danny Bonaduce, Mackenzie Phillips, Michael Jackson....