Ladies, is there any way I could get her to like me again?

Unfortunately, sometimes the chemistry isn't there even when it once was. There doesn't necessarily have to be a negative event, sometimes it just dissipates. My advise for you would be to try your best to move on because it doesn't sound like she is interested. You sound young and there will be many girls to come... you have SO much time :) One more thing, be very careful that you don't appear to be a creeper because once you hit creeper status, it's hard to lose that reputation. If she's asking you to leave her alone, it's best to do so.