Good, because I think you've got a good chance to save your M. You just need to let her build up the courage to come clean. That might not happen for a long while and that's why you need to create a safe place between the two of you so that she feels comfortable when she decides to confess what's bothering her.
Keep up the PMA and keep your interactions light hearted; let her dictate the convos that involve her undesirable behaviors.
