I have an annoying little cousin?

shes 3 and she always asks me questions that i cannot answer,she barges into my rm without permission,she demands attention frm my whole family by doing her so called impressive feats such as walking backwards. also,when i invited my friends over to my house, she started trying whip us with some foam things while crawling on the floor,growling and trying to be some kind of gorrilla/tiger,.also,when i want to play on the computer she will fill her whole head into the screen until i cant see it at all.then she will start asking her unanswerable questions again.she likes to act tough too last wk,she went to slide on my family's sofa and bummed her head on the edge of a glass table.her head was bleeding and everybody rushed to her.she then said "im not crying" and a few moments later, she was crying.she also likes to play with my models and tends to lose parts and she doesnt even feel sorry.