W.M.
I think it is normal, my kids do it, my son more than my daughter and some of my friend's kids do it too. I would just do the best you can to talk her through it and tell her that it is the same either way. When they are tired or upset it is harder to get them to listen but I choose my battles too. If I have made something or cut it already as you say about the strudel, I would just tell them that it is fine and the same as if you did not cut it. I would say I am not making a new one and wasting this one, you will eat this one or you get none and then walk away. don't play the game. they may sit there and cry but eventually they will eat it. after she eats it, tell her that next time you will try to remember not to cut it but that if you do, she will eat it anyway. Remind her that it tastes the same either way. I do think this is normal though.