It's a shame. Some people here seem to believe they somehow "own" the hair of Penny, how freaky is that, huh?
Loving long hair is just a question of personal taste and everyone's preference is different. A friend of mine doesn't like long hair at all because he prefers the unobstructed look at the neck of a beatiful woman. Personally I also don't like a hairstyle much longer than waist-length but it's the damned right of every girl on this planet to choose the hairstyle she likes and *gasp* even change her decision when she wants.
If my girlfriend intended to cut her hair I would try everything I can to convince her to NOT do that but it would be her decision after all. And none of the rude suckers in this thread seem to be the boyfriend of Penny...
Geez, sometimes the Internet is really a giant global cage of fools...