When does self-defense become assault?

Here’s an interesting question for you, because I’ve seen a lot of troll questions that honestly made me think of a legitimate question

Where do you draw the lines between self defense and assault?

Here is the example scenario in this case, you have a high school aged daughter and she is physically attacked by a male the same age as her, lets say he doesn’t sexually assault her, just physical. Shoving her around, hitting her etc, is she justified in attacking his groin to you in this scenario? Or is that something that would instantly make her the assaulter in your eyes? Would your answer change if she unknowingly did permanent damage to the guy that way?

I do not think it would be justified if she did this in a purely physical altercation
I do think it would be justified in this instance, but only if no permanent injury occurs
I do think it would be justified in this instance, the guy is responsible for whatever injuries might happen to him
Select gender and age to cast your vote:
When does self-defense become assault?
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