Help with spoiled rotten sister? (very serious question)?

i would probably totally ignore her and maybe find a quiet park or something to practice? do you have a portable amp? get one! lol or even if you find a place that is a little busy (park or something) you can get the head phones that can plug into an amp and only you can hear it... who knows maybe you will meet people just like you and they have a place you guys can play.... she sounds like a stuck up ****** too btw lol.. you could dish out a taste of her own medicine and when ever she does something consistently that she likes go yell at her lol i used to doo that to my brother, worked sometimes.