Thanks for sharing your experience. I went through the same thing all through high school. It's tough. There's nothing I can tell you that will magically take away your fears and allow you to talk without stuttering. Why don't you just try saying "Hi" the next time you pass her in the hall or in class. See if she says hi back. You may want to just leave it at that or if you feel that your anxiety has lessened you may want to say something else. Good luck, and let us know what happens.