I think this photo is great. What I love about it is the fact that by utilizing the negative space of this photo (i.e. the background that's not in focus) she was really able to highlight the dandelion puff itself. I would tell her that one of the tricks for capturing images (at least in film/television) is to pay attention to all that you have in frame and all that you leave out of frame. If she had placed the puff in the middle of the photo the entire feeling would have been different - not necessarily making it better or worse, just different. While she's learning, she should play around with placement and see if she can see the difference. She's got a great eye. She should keep shooting!