I found my daughter a summer job and this made her very angry. Then I told her she'd be making almost $3000 this summer and she seemed interested. I then told her she would have to buy her own school clothes and supplies because I think she needs to take on some responsibility. The approach worked for my oldest son and for me. What do you think?
I wish that you had not gotten your daughter a job without first asking her. In my opinion, however well-intentioned your efforts were, doing that without first discussing it with her showed her disrespect. Making $3000 in a summer for a 15-year-old is a lot of money. I disagree with your demand that she use some of this money to pay for her own school clothes and school supplies. Unless you are so financially strapped that you cannot afford to buy her these essentials, I think those purchases are a parent's responsibility. If she wants to help out the family in any regard with the money that she makes, let her be forthcoming about doing so.
I would strongly recommend that you change the focus from trying to control your daughter to trying to develop a relationship with her. Reading Parent/Teen Breakthrough: The Relationship Approach, by Kirshenbaum and Foster, will help you do that.