I think that all the hairstyles she had till now give her a different air. Al of them just suits her perfectly. Still, I prefer her long hair ^^.
Still, something bugs me. Have you guys seen the preview for Noche? Even though I'm glad that her hair is growing fast, she has the worst hairstyle in that picture. Those pigtails look very strange on her >_>.
Oh well, I wouldn't mind it if her hair stayed the same and never grew out. As I said, she looked pretty good with short hair as well.
I think that her behaviour became a bit sharper when her hair had a close-call cut. She looked softer when she had long hair. Even though she cried more than before, I still got that impression.