Ms. A had been married to Mr. B for 10 years. Since their marriage, Mr. B had been jobless and a drunkard, preferring to stay with his friends until the wee hours of the morning. Ms. A was the breadwinner and attended to the needs of their three (3) growing children. Many times, when Mr. B was drunk, he would beat Ms. A and their three children, and shout invectives against them. In fact, in one of the beating incidents, Ms. A suffered a deep stab wound on her tummy that required a prolonged stay in the hospital. Due to the beatings and verbal abuses committed against her, she consulted a psychologist several times, as she was slowly beginning to lose her mind. One night, when Mr. B arrived dead drunk, he suddenly stabbed Ms. A several times while shouting invectives against her.

Defending herself from the attack, Ms. A grappled for the possession of a knife and she succeeded. She then stabbed Mr. B several times which caused his instantaneous death. Medico-Legal Report showed that the husband suffered three (3) stab wounds. Can Ms. A validly put up a defense? Explain. (2014 BAR)