I am a little sorry but I just don't feel what I felt for you any more and with work...
After she goes to the market acts like her husband is not home yet andd gets some peas to cook the lambs leg.
This is exquisite.
As you can tell Mary's husband is leaving her after she has gave her whole life to making him happy and doing what he wants. He is also just now leaving her when she is in her pregnancy days, which makes the whole situation even worse.
Poor Mary goes down the stairs and into her basement. She opens the fridge and picks up a frozen piece of lambs leg. Then Mary goes up stairs to cook the lambs leg for her husband. When she gets there she swings the lambs leg to hit him over the head with it. She looks at him laying on the floor then after of few seconds she starts crying.
Mary goes to the market, acts like her husband is not home, gets peas to cook the lambs leg, and leaves. When at home she practices her scream and then, calls the police number to report that someone killed her husband. The police come, investigate her house, next she says they have been working hard and insists them to sit down and eat the lambs leg. Later she laughs to herself because the officers ate the only evidence.