Replying to My sister narced me out for having weed in the house again. what should i do?

the first time i was a sophmore and she was a 7th grader, I was blazing in my room when she came in and was like " i smell weed" i was like no i'm not then she went and got my parents and they tweaked!!! so i took some time away from my sacred herb, but lately i have been back up to my old tricks and yesterday i split a sack with my friend and this shit was the kush so dank. anyway i just had it out and was lookin at it, and my sis bursts in and is like i smeel weed, and i'm like " i dont' smoke pot you know that, you told on me a few years ago" and she then went and got my parents and they didn't tweak but I am just pissed at my sis, shes 15 and a 1/2 you'd think she'd be cool by now.

I'm pissed at her, she got caught a few months ago so i figured she was way chilled out but the bitch just wants to get her older bro in trouble i guess.

what should i do?