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.
Here’s a preview of Evans’ Introduction to to her 2010 Expanded Third Edition.
The book is written with consistent pronouns with he/him as the abuser and she/her as the victim. Evans says this is done for clarity, not to imply that females don’t abuse males, because they clearly do.
Unfortunately the last two pages of the Introduction are not shown. That’s where Evans says that in her clinical experience as a life coach, she has never even once seen a female abuser reform herself.
That introduction was written in 2010, but Evans more recently (2020) said she’s still never seen a female abuser reform (once again, in her clinical experience).
The Google preview (sorry, left it out of the earlier comment):
https://books.google.com/books?id=mrKSDgAAQBAJ&pg=PA15&source=gbs_toc_r&cad=1#v=onepage&q&f=false
We know that true victims of “years of abuse” have resorted and will resort to violence against their abusers. Up to and including homicide. It’s sad and tragic, but true.
Some of these acts are seen as understandable and possibly justified, some not. It obviously depends of the unique facts of each case.
This woman has just (conveniently?) placed herself in that category. The rest of us can be forgiven for withholding judgment until more facts are revealed.
That said, it’s not looking good for her.