Valli refused to go to the stall because she did not have enough money left — she had spent exactly sixty paise on her return bus ticket. She also firmly refused when the conductor offered to treat her, saying "No, no, please, no."
This tells us that Valli was self-respecting and independent. She did not accept charity or favours from strangers. She was also disciplined and careful — she had planned her trip meticulously and would not let any unplanned expense or gesture upset her self-sufficiency.
Source: Madam Rides the Bus, Chapter 7 (Section III)
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The question has two parts — what stopped her (the reason) and what we learn (character trait). Examiners expect both parts answered clearly. The reason is lack of money plus her refusal of a free drink — both must be mentioned. The character inference should use precise words: self-respect, independence, discipline. Avoid vague words like "she was good." Keep within ~80 words for 3 marks.