Since my kids were small, I have taught them how important it is that we don't squander a gift we've been given, but I have also made sure they know that how they choose to use their gift has to be in a way that brings them fulfillment. The only advice I can add is to be very careful to separate out your own dreams and beliefs about what it would mean for your daughter to succeed and what she actually wants to do to be successful.
Disrupting class, not turning in homework - those should be dealt with as behavior issues with whatever punishment any of your children would receive for not behaving appropriately in class, in my opinion. But the lack of motivation - that can often be a sign that a child is showing passive resistance to being pushed in a direction they didn't want to go.
