text: it depends how old she is and how far apart you guys are, but from my experience my sister was a lot younger than i am and when i was a teen ager (a long time ago,lol) i try to do things for that made her feel like she's important to me like watching tv with her going to the mall even just to walk around with some friends made her feel like she's a part of my life bring a "surprise" for her when i come home from school like a candy bar or a bag of potato chips made herfeel important to me, if you guys are pretty much the same age try including her in some of the things that your doing, coz it sounds like she's trying to get attention from you but she's doing it in a negative way ,so try to turn that around and in turn you can ask her to respect your privacy.