It might be a story where the woman achieves a lifelong dream or reunites with a long-lost loved one, and the overwhelming joy causes her death.
Perhaps she had overcome a series of difficult challenges and finally reached a state of complete contentment and fulfillment that was too intense for her body to handle.
To be honest, I haven't encountered any lit stories with such a bizarre and uncomfortable theme. Most literature focuses on more common or profound aspects of life and death.
Well, in this 'the secret of happiness short story', perhaps the secret lies in simple things. It could be about finding beauty in the everyday, like enjoying a sunrise or a cup of tea. Maybe it's about giving rather than receiving. For example, the characters might learn that helping others gives them a sense of fulfillment that leads to happiness. Also, it might be about learning to be content with what they have, instead of always striving for more.
Perhaps there was a deep-seated betrayal or a threat to her life that led her to use the leg of lamb to kill. It could also be part of a complex web of events that drove her to take such a drastic action.
Maybe she was in an abusive relationship and his death brought her freedom and relief.
It could be through the experiences of the main character. For example, if they go through a difficult time and then find something that makes them happy in the end.
Perhaps she had a pre - existing medical condition that was aggravated by something in the room. It could be that the room was extremely cold or hot, which put stress on her body. If she had a heart condition, for instance, the extreme temperature could have led to a heart attack as she was coming out. Or there could have been some sort of allergen in the room that she was allergic to, and by the time she was coming out, her allergic reaction had become fatal.
The circumstances could involve job loss, family breakdown, or maybe a series of unfortunate events that led to her being homeless. Also, societal issues and lack of support systems could be contributing factors.
In the 'happiness by the kilowatt short story', it could be that the author uses 'kilowatt' as a unique way to measure or represent happiness. For example, the story might set in a world where people trade or earn 'kilowatt - equivalent' of happiness. It could also be about how different sources of energy, which are measured in kilowatts, impact the characters' levels of happiness. Maybe a character finds great joy in a place with abundant solar power (measured in kilowatts) because it represents a clean and sustainable source of energy that also brings a sense of security and thus happiness.
It's hard to say exactly who dies without knowing the specific version or details of the story. Sometimes it could be a surprise character or someone whose fate is tied to the plot's twist.