The story's themes are complex. Loneliness is a big one. Mrs Brill's actions, like her regular outings to the park and her over - investment in her fur and the people - watching, all point to her being a lonely soul. Also, the theme of the power of perception. Mrs Brill perceives herself and the world around her in a certain way, but others, like the young couple, have a completely different perception, and this clash of perceptions ultimately breaks her illusions and shows the harshness of reality.
It's hard to determine the theme just from the name 'Mrs Happy'. It could be about happiness, or perhaps Mrs Happy is a character who overcomes difficulties and spreads positive vibes as the main theme.
The main theme of 'Mrs Dalloway' is the passage of time and its impact on human consciousness. It shows how the past, present, and future are intertwined in the minds of the characters. For example, Clarissa Dalloway's memories of her youth constantly resurface as she goes about her day preparing for a party. The novel also explores themes of social class, mental illness, and the search for meaning in life.
The main theme could be about the complex relationships between the two Mrs. Grenvilles. It might explore how they interact with each other, their families, and the society around them.
Miss Marple is a very shrewd and observant character. She often notices the smallest details that others overlook, which helps her solve the mysteries. For example, in some stories, she can tell a person's character from their choice of clothing or how they behave in a social setting.