I would suggest painting it her favorite color-
Then you could paint a HUGE and BLACK tree with branches outstretched on the wall-
I would really like that in my room hehe
Posts by Panda-Goes-Rawr
a mood board with magazine clippings and pictures. It gives you a theme.
There is a project on here for drawing a model:
http://www.cutoutandkeep.net/projects/draw_a_basic_standing_lady
A good book on fashion designing:
The Fashiion Designers Guide to Shape and Style
it has a model already premade and traceable designs you can edit.
Hope I helped