Many women seem to be particularly prone to acts of craziness. Beautiful women are even more so. The simple answer is, that they are given more opportunity to be crazy, and crazy behavior seems to be more readily accepted from them. That is, they learn crazy behavior and that they can get away with it. Specifically, neurotic behavior can be thought of as individual actions that seem inappropriate, obsessive, or dangerous - particularly in the context of a situation.
Crazy behavior is more of a lifestyle and usually involves psychotic activity.
It affects almost every aspect of a person's life, and tends to directly impact those that come in contact with the crazy person. You see, she will probably not start off showing you craziness early in your relationship. It is appropriate to note that men can be crazy too. In general crazy behavior is not tolerated as readily in men as in women. It seems that acting crazy automatically reduces or eliminates concern for the views of others.