What can I say? I already understand you don't like her. The points about you not liking it are clearly understood by now.
Ashley however isn't the crazy sociopath you claim she is. She isn't going out of her way to start fights (though she does engage in them early on, like you said, defense mechanism), or attacking people with knives, nor does MC go along with any of that. Friendship 13 is very early in her story. You also don't fix a broken person by being cruel to them (which is also not something you do in Lin's story?) You have a very wrong impression on her character and story, simply because you haven't played all there is yet. Others can attest to this. I hope anyone who deals with any Ashley in real life doesn't think they're just a sociopath who attacks people.
If you want to argue with the writer over the intent of a character you haven't fully experienced, this isn't a conversation I want to further engage with.