There are quite many girls who like sometimes to have long hair and sometimes to have short hair. I can't understand it, because I don't find these kind of changes to be a big deal, just they have less personality. A good example of it is Cameron Díaz, sometimes she had quite long hair like this:
And sometimes she had quite short hair like this:
The second hairstyle is the first I've ever seen, then I find her with less personality, when I see the first one in her, because she prefers to wear some different hairstyles than choose one to be the perfect for her.
In the other hand I admire some other girls like Catherine Zeta-Jones, who I've always seen with long hair and I've seen her with short hair. That means she has the principle of always wearing long hair and makes her a girl with stronger personality that girls like Cameron Diaz.