Well, I am back. Let's just say our discussion was full of eye rolling, huffing and puffing, and petulance (and a little defiance). I thought her daddy was going to kill her, but he kept his cool.
We figured that she had burned through over $800 a month

over the past three months . We broke down a budget for her which she thought was more than reasonable (as an afterthought though DH and I think she thought we were going to give her that amount of money each month

). She then realized that we were budgeting the money that she will have available.
She was shocked to realize that she had spent that kind of money and had nothing to show for it. Instead of charting out for her what we spend, we charted out what her life would look like if she actually was paying for everything. She quickly backed up, but her attitude did not change.
Her attitude was very eye-opening for her daddy and I (I can honestly say that we have never seen the attitude we saw from her on Saturday). She left very shortly after we talked with her and she was not happy. Oh well. She knows that if she does not have money for summer school, then she is out of luck. She also knows that if she cannot pull it together up at school, then coming home is her next stop and we both thought she was going to lose it. Better to learn now than later, like it or not.
I appreciate everyone's advice and opinions. It is nice to see others viewpoints, although I do realize that everyone's experience and circumstances are different. Thank you again for your input!