My classmate got mad at me because Im on my period

I have this one girl in my class that follows me everywhere and acts like we are besties and stuff like that and today she texted me saying that we gonna practice in PE and I responded saying that I cant because Im on my period and she genuine got MAD AS FUCK and started saying that I wont have my period that day and that I have to go with her and stuff like that and I got annoyed and told her off so she called me bipolar for that???(Im not diagnosed with anything) And the best thing is that I have messed up hormones, which is why I have my period more than once a month and she knows that so its not weird for me to have a second period in the same month. And then she told me she "had a long day and its too tired for drama" but she literally created the drama, Im seeing her tommorow at school and Im already tired..

Ps. I wont even go to PE if she wont stfu idc