Why didn’t Valli want to go to the stall and have a drink? What does this tell you about her?

Valli did not want to go to the stall and have a drink because she did not have any money for that. Even when the conductor offered her a cold drink free of charge, she refused firmly and said that she only wanted her ticket. This shows that Valli had a lot of self will and pride. Possibly, she did not want to take anything for free, particularly from a stranger.