This autistic girl I know won't stop touching me. How about if I yell at her?
Oh, jeez. Why do you want to yell at her?
I'm sick and tired of her continuous touching and I don't mind how physically disabled she is
I don't think that's the best way to handle this.  Yelling at someone, especially someone with a disability, is wrong except under exceptional circumstances, which these aren't.  You could politely ask her to stop!
Fuck it, I will yell at her.
I'm telling you, you'll get further if you respond more politely. You also won't get yelled at yourself by her parents or other adults.