I agree that you should talk to her in a calm and friendly manner and situation outside of school if possible. It is important to understand though that almost noone acts like an asshole without having an unfullfilled need being the reason behind it. Understanding what it is that she needs instead of just telling her to stop without actually filling that lack of love/praise/… will help you both. Try to open the conversation in a sense of you feeling something is off with her and wanting her to feel good, instead of you telling her that she is doing something wrong. That obviously triggers her in some kind of way and will make for a rocky start. I think it’s great that you don’t judge her but instead are looking for advise. I would have needed a friend like you when I was that age.

Since I work with teenagers I might have some insight but it could be a completely different reason so idk, take this for what it is: my mostly uneducated opinion: From what you described in your post to me it seems like she is craving praise in a sports context. Maybe she feels like she is not good enough or has been told that by her family. Not being able to compliment you for winning a point could be a sign of that and her jealousy towards others being praised. Maybe she is comparing herself to a sibling that seems to be getting more attention from a parent because of their fitness abilities. Maybe she is angry at something completely different and it just shows during sports because of the atmosphere and high energy levels.

I’m unsure if they count as bugs but I got stung in the head by a wasp yesterday while it was 5°C and -2°C the night before. They can not be bothered.