I think someone's been documenting FL speaking to her dad and it will be blackmail material for later (I think of either ML, or ML's family). I think ML knows that she can speak, he did say he was trying to control her, he also said she was his hostage. The least thing you do to a hostage is to spy them no? And the girl's been having chats with her dad in open spaces!
2d ML definitely was sent to wreck some havoc here, the timing is just too good.
I also predict that this drama will make me mad very soon, because the FL is one of the dumbest people on earth. The kidnapper was good enough to hack your car, you think he can't get access to his own phone for heaven sake? I can feel my heart beat faster while I type these words. Please, writernim, please don't give us a dumb heroine.