Is Mary maloney not guilty due to temporary insanity in lamb to the slaughter?

In "Lamb to the Slaughter," Mary Maloney's actions can be seen as a crime of passion due to emotional distress rather than premeditated murder. Her sudden shock and impulse to protect her unborn child could be interpreted as a temporary loss of control rather than premeditated intent to kill her husband. The story leaves room for interpretation on whether her actions were driven by temporary insanity or not.