Final answer:
The question about what Sophie started doing regularly at lunchtime cannot be answered due to insufficient context and information regarding Sophie's actions or the text she is a part of.
Step-by-step explanation:
The question "What did Sophie start doing regularly at lunchtime?" does not provide enough context for a definitive answer. The various excerpts given as reference present different characters and scenarios, none of which directly mention a character named Sophie. Without additional context or information specifically regarding Sophie's actions during lunchtime, it is impossible to provide an accurate response.
If the question pertains to a specific piece of literature or character study which has not been included in the references provided, please provide the relevant text or background needed to accurately answer the question. In literature, characters may start new routines or habits for various reasons, often as a reflection of their emotional state or a change in their story arc.