Why does Valli refuse to look out of the window on her way back?

Explanation

Valli refused to look out of the window on her way back because she saw a young cow lying dead by the roadside, just where it had been struck by some fast-moving vehicle. It was the same cow that was running in front of their bus, during their trip to the town. She was overcome with sadness. The memory of the dead cow haunted her and therefore, she refused to look out of the window.