Who is wrong? Me or my sister?

I have a Fraternal twin (I'm a guy and she's a girl). My sister has been playing these horrible pranks on me for the past week. They all include salmon. I'm very allergic to salmon. Sometimes she throws it at me, puts it in my coat pocket or in my shirt drawers (then I have to wash all of my clothes). I finally had the last straw when she popped out from behind a door with a Salmon with its mouth open. From a combination of being scared senseless, tortured for the past week and being allergic of Salmon it all came to a nasty punch to her nose and tooth, breaking breaking her nose and slightly chipping a tooth.Even though my family knows I'm allergic to salmon and the fact that she's been playing life threating pranks on me constantly for a week, they seem to be on her side (except my mom, and uncles and grandmother. My aunts, dad, and grandfather seem to think otherwise.) Half my family think that breaking her nose before some school dance is all my fault and wasn't called for. The other half of my family think that she deserved it and needed the lesson for other's respect. I don't understand why they are taking her side when she has been playing with my health for the past week! Personally I think she deserved every ounce of nose/tooth chipping breaking punching force! Its not like I had the intent to find her and punch her in the nose and breaking it. I'm in the right? Right?! What would you have done in my situation?