What Does Mary Maloney Symbolize In Lamb To The Slaughter

In the short story Lamb to the Slaughter by Roald Dahl, the women, Mary Maloney is waiting for her husband to get home, relaxing, missing her husband, with two glasses and some drinks (page1). She was pregnant with a child, six months. She heard her husband pulling up outside, so he come in and she stood up, walked over to him, kissed him and greeted him. He was giving off a bad vibe like he didn’t want to be bothered or he just was irritated with someone at the time or something was bothering him before he came home.
He drunk the drink with one swallow that was a sign of acting strange but she didn’t speak on it so she started talking to him but he never said anything. (page1) She wanted to cook him dinner because she thought he had a tiring day, so when she asked she was feeling caring, and when he said no he didn’t want any she thought that he needed something to eat because he been at work. He again declined but this time retorted his answer, after that he told her some news but the way he was talking was like it was he was bad news because it say he was motionless and kept his head down (page 2).
After Patrick told his wife was thinking long, hard, and a bit confused, like she didn’t want to hear what he was saying. After that she said for that last time she’ll fix supper but said it in a low voice, she sound like that
(page 2) By now, she was putting the meat in kitchen, and started to put it in the oven so she could cook it, and washed her hands. She went upstairs fixed her makeup and started to smile in the mirror and rehearse lines that she going to tell the clerk at the grocery store in neighborhood, she went there and spoke to Sam and asked for some beans and potatoes, and he gave her some cake because he know that patrick likes it (page