I'm upset that my wife didn't do the dishes
Am I surprised to hear you say this.  Does this have to do with any past arguments?
No, it's just that my wife is not doing her share of the chores
If she promised to do the dishes then they she keep her word. Talk to her about this and find out why she hasn't been doing them.
You are right. I should talk to her.
I think you are doing the right thing. You should talk to her calmly about the issue before you get too upset.