I agree with you that she could turn them on and off at will. It seems likely that she learned at a very young age that temper tantrums, complete with tears, would cause her parents to back off. So, imo, at any given time, tears could have been: 1) a 'real' reflexive reaction; 2) a false on/off such as she tried to work up at JB's office over being indicted; or 3) an actual real event, although not for the reasons appropriate to the situation but instead, for herself and/or being thwarted. The tears over TL leaving her could have been either of the three but I'd bet on #3, if I were betting. She had a lot riding on this "relationship" and had invested a lot into it, by her standards. Having it taken away and blowing her belle vita fantasies of becoming a famous band promoter with TL could have caused her to become truly upset for herself.