My d. is bright with high predicted grades but now she has been with a boy for the last 12 months she has just stopped putting any effort in. I get letters from school saying she is behind on coursework and if I approach the subject she just says ' I am trying my best' and gets stressed out and storms off. I do not pressure her and let her see her boyfriend at weekends but i just don't know how to manage her to get her to study. She just digs her heels in. Any advice would be greatfully received.