Sounds to me like your "friend" isn't really your friend, anymore. You've repeatedly told her that she's offending you, yet she continues to. She's acting passive-aggressively and gives every sign that your feelings don't count to her. Perhaps she's jealous of you? Has your circle of friends dramatically expanded during your high school years? She may being felt left behind. I don't know. But, if this is more than a minor annoyance to you, I'd recommend, at the least, an extended period of ghosting. Sounds like that may be the only way to let her know you're serious.
Good luck!