IMO You gave her wise advice many times about being aggressive towards other ppl. There are other ways to solve differences peaceably. If she chooses to ignore your warnings, that is her choice & decision - could be a painful way for her to learn ? If she is dumping on you with her problems maybe you need to establish boundaries for yourself. Esp. if your going downward. Something like "I'm sorry you are having problems, but I am having a difficult time in my life too, & I need someone to be there for me too". With her overt body language she is telling you she doesn't want to hear or even listen your problems, perhaps she can't handle it, & that's ok. Sometimes when we are in tremendous pain ourselves you cannot take on someone elses problems without both of you drowning. Please take care of yourself first, then if anything is left over perhaps that you can share, w/ in your boundaries. She does not seem to want to follow your suggestions about not fighting, ok then she has chosen the consequenses (possibly hurtful to her) maybe she'll learn from experiences ways to settle differences peacefully. In my opinion.
Holmes