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It's self-defense. Not matter what age if you're life is in danger you fight for it. She had no other option than to kill them. I'm young so I can give you a pov. I'm 14 and if somebody had captured me and then proceeded to try to kill me I would kill them first. Even in this modern time, when it comes to my life or theirs I'm picking mines. It's not becoming a villain it's becoming a survivor.
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Would you really be more concerned about being a "murderer" at a situation like that? It's do or die bruh. She tryna survive and who wouldn't be angered by that? Your friends got beaten up, and one of them got a knife stabbed deep in their hand ಠ︵ಠ It's just the start of her character development, let's not assume that she's going to be a villain and see take lives lightly. It's too early for that
I feel very conflicted about everything that is happening, ofc I get it she did to defend herself and the other kids well being, and she is more than right to do it, but the thing is what she is doing is still murder and she is just a kid, I guess she is not since she has idk 20+ years of memories but u get the point, a kid nonetheless. Yeah revenge is satisfying but murder is still murder, and after you kill once you might start to seem humans lifes as nothing more than something you can control. So I'm worried and I don't want her to go the wrong way. Well I love villains but I wasn't expecting to a 12 yo to become a villan. Man I'm conflicted (╯°Д °)╯╧╧