What are you so much rasperezhivalis? Well, of course, children are better not to beat. With this, I also very much agree.
But every mother who has raised or still raising children, believe me, every one has moments when she regrets what she has done, is ashamed, feels guilty about some of her actions. Often it is absolutely impossible to raise children without ever having broken them. Moreover, your daughter can feel your tension and catch your efforts to be a good mom, and therefore mischievous, because she doesn’t need a good one, she needs a lively mom.
Here it revives you.
First of all, you should calm down yourself. The more you blame yourself, the more suffering it can cause your daughter.
You broke. It happens. Moreover, the reason was obvious.
A computer is an expensive thing, kefir for hair is also useful for the stomach, but not even for technology. My daughter really broke important rules.
Perhaps she did not know about them, and maybe she did. But violated.
When you calm down, you can tell her: When you poured kefir on the computer, I was very scared and angry. Because I really need a computer, and this is an expensive thing.
I was scared that now it will not work. And she got mad at you, so she gave a pope and put it in a corner. I’m really sorry I hit you.
I do not want to give you a pope and put you in a corner. But for this you also do not need to break important rules. I’ll scream and get angry at you sometimes.
But I will not beat the pope (or try). I’m sorry now you’re scared when I scream.
But often, without shouting, I cannot make you understand that I am angry with you. So you describe to her what happened, explain the reason for your explosion and state your intention to continue not to beat her.