You've tried talking, didn't work.
Leave her alone, to let the emotional dust settle, and for you both to have time to think. After two years, she should know how important work and school are to your future, and you should know how important your free time is to her. Always remember that. Give it 2 or 3 weeks and then see how she feels. Don't have expectations of renewing this relationship, but see if she is at least willing to talk about it. Seems as if you would have had a clue she wasn't happy, and it must have been for a while, because I doubt she just woke up and decided she wants out. HMMMM!