I'm not going to do super-easy tasks for my sister
What sort of tasks does she want you to do?
I'm talking about a networking task for a local youth organization. It's a super easy task
If it is so easy, maybe just help her. I know that she will appreciate it in the long wrong.
I can't do it for her, she keeps bothering me with these stupid things.
If she keeps asking you to do these things then she is in the wrong. But I don't see the harm in helping her every once in a while.