I'm going to block a girl without provocation
Why do you want to block her then?
I'm just tired of her bullshit and I don't want to deal with her.
It's rude to cut off contact with someone without explanation. You should explain to her any issues you have even if you want to stop talking to them. That way they can understand and move on.
It's a big load of drama and I don't want to deal with it.
Drama or not, I think that cutting someone off warrants an explanation. They are going to think that you are the bad guy if you make no effort to tell them why you are cutting them off.