My english teacher is a piece of garbage

I gave my english homework a day late but I was making a very important internship report, i was working day and night, and that homework was to be made in the weekend so I didn't sleep at all, and when i finally gave her the day later the due date she gave me a 8 out of 20(40%) and when i asked her what the original mark without penalties is she said 17 out of 20 (85%), i wouldnt be this mad if i didnt have a super important exam to take this year, considering that every grade counts, and that she literally hates me for no reason when im the best of the class. (I live in France btw)