A few weeks ago I wrote about the importance of choosing friends. I got many comments asking me to share about one of the other aspects of choosing friends, and that is letting friends go. In the same way that we want to help our girls understand the power of a good friendship, one that helps and supports them, and encourages them to be their best, we also want to help them identify when a friendship is no longer a friendship. To a teen girl, her friends define her world. And it can be a very painful process if she…