Was I wrong? Am I a bully now too?

Okay so in my class there is this girl who's just a bag filled with trash and make-up. She's bullying all of my best 프렌즈 (me included) and I was so sick of her shit that I decided that whenever I get the chance to screw her over, I take it.

So I did. We had this English test that both her and I had to do later because I was really sick and she was fake-ass sick. So during English class I ask the teacher when to do it and we make a 날짜 for the 다음 일 because I already studied it, since it was four days later than the actual test was. BUt she hadn't and she said to stall it even more.

So I told the teacher; "Just give her an F then because obviously she just didn't feel like studying for it so she called in sick" and the teacher actually did that(i couldn't believe my ears o___O)

So then the 암캐, 암 캐 starts calling me names like horribly but before the teacher could say a thing I called her names back since I was so sick of her. I told her; "the only reason 당신 bully people is because 당신 have no self-esteem -no reason to either- and want to drag people down with 당신 in that pathetic little hell of yours that 당신 call your soul" and apparently I hit a soft spot because she ran out of the class crying and called in sick for the 다음 two days.

I got a standing ovation from my class and I had a little moment of "VICTORY!!!!!" but I also felt horrible...

So what do I do now? Just keep on screwing her over because she's still an awful bitch. 또는 just ignore her for the rest of the year?