What are you basing this statement on? Is it too much force because she is a woman, or just too much force in general?
If we replace the woman with another football player, is it still to much force?

To me, it looks to me like he responded with equal force. He was just better at punching than she is.
Just like if it was a shootout. The fact that you hit your target and the other guy missed doesn't mean that you used more force.

The whole logic of having to assess the potential strength and fighting ability of your attacker before striking back is dumb.

The appropriateness of a course of action should be the same no matter what the gender, size, strength, etc. of the aggressor.