Avery should not have committed adultery.
But she was wrong to attack him with a knife.
Are the current accusations of abuse by Avery true, or is she now slandering Avery?
Is she trying to somehow justify her act of violence?
Male abusers do not always reform, but some do. Female abusers, on the other hand, seem almost never to reform (see the introduction of the book cited below).
Abusive women tend to remaining unaccountable for life. Society appears to want to look the other way rather than hold abusive women accountable for what they do (including both verbal abuse and physical violence).
https://www.amazon.com/Verbally-Abusive-Relationship-Expanded-Third/dp/1440504636
Yes, she is. And the courts agree with her justification. Like you pointed out, men carry a different burden. There is no "fairness" in male-female relationships.
Adultery is wrong but NOT a crime.
Attacking someone with a knife and cutting them is a CRIME.