Not really, unless she always wears that color. It's kind of like asking of a guy wearing a red shirt is passionate, or if a guy wearing a blue shirt is peaceful. He could be, but more than likely he just threw on some random t-shirt without thinking about it. I seriously doubt much thought goes into most girl's nail polish beyond how it looks. In fact, I don't even think they think about that too hard, because a lot of the time I see girls with their nails all painted different colors and with some of them having polka dots and shit.
There is probably an article online about that. The topic sounds familiar. Try searching for it. But I don't think the nail polish really says much about the girl. They made the article just for entertainment and so they had something new to release.
I wonder about that sometimes. Do they use one color because it says something about how they're feeling? Or is it just to match an outfit? I don't know if it reflects personality, or just that they like a certain color. It's an interesting thing to think about, either way.