It didn't make sense too me either, but then someone commented in another blog about this and suddenly it made sense:
While I'm not particularly impressed by Hester (I'm a grown-up, so I prefer Sebastian's elegance to Hester's cute) she did say something that stopped me short and made me totally sympathize with her. It was something along the lines of, "They all told me that everything I thought was good was bad." My heart broke for her. How many creative people have had a similar experience? Sometimes it may be true, but I suspect more often it's not. It made me wonder how many breakthroughs in art, music, fashion, or literature have never reached an audience because the artists were so discouraged and disheartened that they gave up.
Having had similar experiences in grad school I can completely see this happening to her (especially considering how some people find her work juvenile) and my heart breaks. While I'm not sure about the "kicking someone out of school" part I can definitely see the "making someone design in a style that doesn't suit them or their aesthetic in an effort to teach." Especially since she was in her junior year; they tend to weed out time wasters and not serious people freshman (and sometimes sophmore) year. The only way I can see that happening is if she was constantly argumentative with the teachers and never had her projects done on time.
I'm a teacher in a high school. Whenever one of my students gets a bad grade, it's usually because "you just don't like me." And of course every kid thinks they are the next misunderstood genius. So I am highly suspicious of Hester's story. Now, I can see a teacher pointing out that her looks are not very marketable, she might want to think about that, etc. Maybe the teacher was being cruel in order to be kind. But conspiring to throw her out of the entire school? Give me a break. Guarantee you there were other issues going on.