Often when teens are disorganized it is because they have an undiagnosed learning disability or ADHD. In girls, this can be particularly difficult to diagnose. It is important to be supportive, rather than critical of your daughter, especially if she is frustrated. The fact that she isn't 'taking pride in her work', doesn't mean she doesn't care--perhaps it is just very difficult for her. I suggest that you speak with a school psychologist and possibly have her evaluated to determine what you and school can do to give her the specific support she might need.
Good Wishes and Great Parenting,
Dr Susan Bartell
JustAsk Expert www.drsusanbartell.com
NEW book “The Top 50 Questions Kids Ask”