^Just one little thing I wan to comment on.
Some people with Autism just CAN'T do certain things "normal" people can do, but that doesn't mean they can't get help, or they won't be able to. I couldn't for the longest time tie my shoes. But I was able to when I was seven or eight.

Your sister may not be very good at video games right now, but maybe have her play some easier games to get just the feel of certain games. Then slowly go to more challenging games. ^^ Maybe their is some fake atm thing she might want to practice with so she can understand those things better too.

For awhile I didn't have a bank account because I simply couldn't understand it and I just didn't care for money.
So my mom allowed me to have a "Parent Bank" thing for me to understand the concept of writing checks, putting them in my savings and those things.
People with Autism might have a slower time then others to do certain things, but that doesn't mean they CAN'T do it.

Be patient with them, they're perfectionist people...

They want to do things right and at that instant. One day they will understand that they aren't perfect people and that it's okay to make a mistake.
Lol, now I'm just rambling...anyhow I hope that helps ya.
