I'm going to yell at my friend the week before she gets married
Why would you yell at your friend?
I have been angry with her, though I do I wish her a happy and healthy life.
It is wrong to yell at your friend and possibly make them mad before their wedding. If you offend them you could get uninvited from the wedding.
It's fine. I don't think they'll like the wedding anyway.
It normal to be mad at friends sometimes, but yelling isn't okay. Also, this is stressful time for her, so you should avoid adding additional stress.