Sg, I'm hanging out with you in your room, and using the computer when you would rather I help you put your lizards and reptiles cards back in their case (for the tenth time in fifteen minutes). I understand that repetition is an important part of learning, but I seriously have no further interest in assisting in the packaging and unpackaging of the aforementioned cards. Anyway, as I'm typing this, you're experimenting with hitting me to get your way.
It isn't working. And no offense, but you hit like a girl.

I thought about ignoring this post, but...
Your toddler has a computer in her room?
I suspect you made the right choice of not rewarding the violence with attention. The lack of reward is probably a better behavior modifier than if you were to reprimand her for the hitting.
There is a computer in her room
When I'm in there with lappy.
That's crazytalk!
No one could possibly have or need a computer that they could carry around with them from room to room! Just the punch card reader alone weighs several hundred pounds! Not to mention the magnetic reels...
Oh, wait, this isn't the 1970's? Duh.