I'm not a lawyer, neither I'm i a law enforcement officer, but from a layman's perspective I know that we should not take laws into our hands, because there must be a punishment for every law that is broken. I guess that it is quite understandable why she had to take the law into her hands and murdered the husband, because the man probably intentionally absconded and must know about the trials of his wife and her imprisonment. So the wife must have felt that he's better off dead, since she has served time for his death.

She should have sued the government and her husband, maybe get a good good lawyer and claim heavy damages.