u/Justalonerlol

So basically, I’m 19F and I have a friend, let's call her friend a, who lives on the same floor in my hostel dorm. I've noticed she tends to get mad over small things. One time, we were out in the city and another friend, let's call her friend b, was trying on lipstick, and the tiniest bit got on friend a's sleeve. friend a got hella mad and started saying stuff like "watch where you're going and be more careful." She said this in a very aggressive manner even though friend b had apologized. Friend b got defensive and said that friend a should be more careful, too. I didn't know what to do, and I tend to laugh as a nervous response, so I started laughing. Friend a then got furious at me and shouted at me to stop laughing. Eventually, she ended up apologizing to Friend B, but not to me, even though all our other friends agreed she owed me an apology.The other day, me, friend A, and another one of my friends friend C were hanging out when I accidentally dropped a tiny amount of water on friend A's laptop. Obviously, I felt terrible and apologized to her twice, but she didn't give care and just kept getting mad, saying, "What the f, you should be more careful!" In fact, she started shouting at me even more when I said sorry. Then I put my hand over my mouth in shock, and she lashed out again, telling me that I never take anything seriously. Meanwhile, friend c had bought her a tissue, but friend a was ignoring her, too. Friend c later approached her, because she was sure she would apologize to me. She just told her that her anger at her laptop potentially getting harmed was justified but she thinks it was not justified to shout at me even after I apologized.Friend a got mad at her instead, claiming friend c didn't understand the situation, and that she was upset at her for saying this to her when she hasn't experienced it herself. She even tried to guilt trip her by saying, "I know you guys were shit-talking about me," even though she had zero proof.She told friend b that I "always laugh and never feel guilty" whenever I mess up. Friend c explained that it's just my nervous response, but friend a refused to listen, insisting I do it to joke my way out of situations. She even said she feels like she's in the right and is not going to apologize for getting mad. She then claimed that she doesn't know if the laptop is even working, when 2 hours before friend C talked to her she asked friend c to read her essay which she wrote on the computer... She then claimed her brother said that even the smallest amount of water can ruin the motherboard and idk how true that is.Eventually, she just ignored friend c until friend c said hi to her first, even though friend c did nothing.This isn't an isolated incident either, as she tends to do this kind of stuff a lot, particularly to me and friend c. Our other friends tell us it’s because we don't set strong enough boundaries with her. For example, she once got mad when friend c was tired and didn't want to go to the mall, but then got mad at her for backing out when she was tired. Another time, when a group of us were getting tickets to come back to uni, plans changed because no one knew the reopening date. She got incredibly mad because " her brother needed to get her tickets and he was at a wedding ,and we always make plans and back out last minute ". Even more frustratingly, another friend literally spilled sauce in our fridge, and instead of saying anything to her face, friend a just complained to the rest of us behind our backs and didn't shout at her.I honestly don't know if I'm overreacting here. I accidentally dropped the water, which I feel bad about, but I apologized. I truly don't know what more I could have done.