I think I should ask the waitress to fix my coffee
Why do you need your coffee to be fixed?
I don't want to be here waiting on my coffee while she's playing around.
It is fine to ask for your coffee to be fixed if you do it respectfully. As a consumer, the business should ensure your order is correct.
It's not incorrect it just hasn't be made yet
Are you sure she's really doing nothing. It could be that a fresh pot of coffee is being prepared, and she's just waiting like you. It would be better to just try to be patient while you wait.