I'm going to scold my gf for almost poking me in the eye with a stick
Why was she swinging a stick around?
She was trying to hit her annoying little brother, but she missed and hit me.
Your girlfriend was being very irresponsible and dangerous, and you are right for calling her out on it. She could have blinded you for her actions, and that is not forgivable if it does happen.
I want to punish her by not speaking to her.
Don't you think she might feel bad about it? It seems a bit childish to give her the silent treatment. You should tell her how upset you are.