Is it normal to have a sister like mine?

My sister is past the sense of weird, she has a small doberman/chihuahua thing she keeps as a pet, she hates pudding(that's one of the worst parts) when she gets in bed, first she puts her head on the pillow and then twists her body to go under the covers, she sits oddly ( I do that to soo..) only wears pink, she is great at video games and eats a lot of pizza, she eats a lot and never gets fat, she is 8 and talks about how hard puberty is, has a freaky zombie friend (looks like a zombie, but maybe it's human) and talks about politics to me.... oh, and she makes out with a poster of Robert Pattinson and later takes the poster to bed, how twisted is that?