First of all let her try to do it, and then you beat it her. Or you could try to include her because your little sister just wants to spend time with you. Or you could not react in any way because your little sister by the sounds of it is trying to annoy you. Maybe during school if you have free time or whatever you cal it, or whenever your sister is not at home or if she's to busy with something else you play the sports. You could just invite a bunch of friends over that your sister does not like and she'll spend the whole time trying to avoid you. Maybe going to a park or something.
An odd idea, but it just might work. Ask her if she would like to learn how to play. If she is interested, teach her. Helping her get game can also help you with the game. After some practice, you can then say soemthing like. "Ok, now I need to work on my game so I can get better and teach you better."
I think while you are practicing, or playing, include her. And teach her how to play. I play volleyball and my little sister does the same exact thing!! Just include her for like 20min and then tell your mom to get her away from you cause you have to practice!!:)