Standing 6'1" at the age of 14 had a tremendous impact on my career; it was the factor that propelled me into a self-taught education in how to use cuts and proportions to my advantage. Regardless if it is a body image issue or due to your teen wanting to "fit in" with the way her friends dress, I can help.
While it may seem indulgent to have a stylist for your teen, imagine the frustration (and money) you could have saved had you learned how to dress in your teens! Plus, a suggestion from a Stylist is always better received than motherly advice - and yes, all "suggestions" can be discussed beforehand.