I laugh at her frustration . . . Is that wrong?

I have been trying to teach the Little Princess that some ways of expressing frustration are unacceptable. I would love to be able rule out anger and frustration completely but seeing as how I am not almighty and I can't rule her emotions, I figure I can at least get her not to beat on me when she is frustrated, yes? I guess that isn't too much to ask of a four year old, right? LOL.

Anyway, yesterday, I was dragging her out of somewhere she didn't want to leave and she raised both of her hands to hit me and then remembered that she wasn't allowed to do that, so instead, she just waved them both in the air and kind of grunted. It was the funniest thing and much to her dismay, I just bust out laughing. Not the response she was hoping for, but I figure that waving your hands is a pretty harmless way to show that you are frustrated.

This morning, she didn't want her daddy to leave for school. So, in keeping with the no screaming and hitting rule, she smacked her fist on her palm and said, "To heck! I NEED DADDY BACK!" Not screaming but very emphatic. Well the fact that the worst words she could think of were, "To Heck!" was so funny. (Also a testament to the fact that my efforts to keep swearing out of her earshot haven't been in vain)

On a side note, she is hating that he is in school. He used to be the one who stayed home with her and she hates that now he is gone all day and on long days she hardly sees him at all.