Why did she stop talking to me?

AHHH. Contact her. Please. She prob stopped contacting you just to see if you would still contact her and be interested. Now if you have tried contacting her more than a few times and she has ignored you then I would try and let it go and find someone else. If you are waiting on her to contact you DON'T do that :)

Ask her out. Don't be shy. Be confident. We like that

Of course you should call her and ask her to go out!
confidence is everything

Yes, I think you should. Cuz this way, if she says yes, then she's not avoiding you. If she doesn't answer then you know she's avoiding you. I dono. Just go for it. good luck!

Call her up see whats wrongs sometimes when a girl doesn't like a guy she gets away in order not to hurt him......the best is telling her you want to know things straight out

Only way to get over your shyness is to talk to girls. Don't have an angle, don't try to be their boyfriend, don't try to score, don't try to be Rico Suave, just talk to them casually and you'll find that your shyness will melt away and give way to confidence which women like.

As for this girl, call her up and go out.

Again, since you are shy, don't have an angle or try to play it out into boyfriend/girlfriend territory, just go out as friends who share a common interest in snow boarding. This may help your shyness since your mind won't be racing trying to figure out what to say, what to do, how to walk, how to talk, or how to close the deal.

Woman, like men, pickup on the fact that you are nervous which only makes them nervous as well. When both of you are nervous neither has any fun so just take it easy. No angle, remember, just friends.

Couples who have been together for a very long time always view each other as best friends so why ruin what could be a good thing by worrying about whether she likes me as a friend or boyfriend?