The "hair colors" aren't just for show, they are a representation of her withdrawal and the emotions conflicting within her. Her design is a reflection of, "wearing your heart on your sleeve."
I wanted to take a "Mary Sue" stereotypical character and give it a bit more meaning. I know it is going to be difficult, specially since many would pass by her due to the appearance, but it really interests me. I cannot describe her fully since her story is not yet completed/decided on (I wrote the story twice now).
But, she plays a major role in my Head-Canon of the mlp story that left so details vague. I just can't seem to feel satisfied with her story yet.