Final answer:
The exact event from the provided excerpts that made Lily believe more strongly that her mother may have been in the pink house is not explicitly stated. It seems to involve Lily Dyer's relationship to the main character, Louisa, and indirect references to the significance of the 'pink', reinforcing her belief through personal realizations and observations.
Step-by-step explanation:
The event that reinforced Lily’s belief that her mother may have been in the pink house can be deduced from the snippets of the story provided.
Lily Dyer’s involvement and significance to both the main character Louisa and the reference to the “pink” in a later excerpt indirectly suggests a connection to the pink house. However, the exact event from the provided text selections is not explicitly clear.
It seems to be related to a culmination of observations, feelings, and possibly overheard conversations that lead to Lily's intensified belief. The reference to sewing clothes and pondering a decision, having no cause of complaint but not wanting to change her life, also hints at an introspective moment where she may consolidate her beliefs about her mother's connection to the pink house.
The event that made Lily believe even stronger that her mother may have been in the pink house is not provided in the given text. It is possible that this event is not mentioned in the references provided. Therefore, without further information, it is difficult to determine the specific event that strengthened Lily's belief about her mother and the pink house.