Final answer:
The provided excerpts do not directly explain why the mother goes into the hardware store in the story 'The Sky is Gray.' Based on the narratives provided, any reason would be speculative, as they focus on family dynamics and their struggles rather than specific actions such as a visit to a hardware store.
Step-by-step explanation:
In the story "The Sky is Gray", the mother's decision to go into the hardware store is not explicitly depicted in the provided excerpts. The material provided discusses various family dynamics and the struggles they face, such as the decision to build a new barn versus a decent house, the mother's assertion of her right to a livable space alongside the animals, and the emotional truths of aging and family. However, based on the narrative context and considering typical character motivations, it's possible that the mother may go into a hardware store to purchase items necessary to maintain their life, symbolizing her practical nature and determination to provide for her family despite hardship. Without the exact moment from the story, it's challenging to ascertain her precise motivation for going to the hardware store.