Why does Adeline refuse to beg Niang for tram fare even after all of her siblings have done so?

"The children’s schools were a fair distance away and the number 8 tram ran directly from door to door. But the children were being taught an austerity programme to teach them about the ‘value of money’, so they weren’t given any pocket money, meaning that they couldn’t take the tram to and from school. When Ye Ye first arrived in Shanghai, he gave them tram fare to go to school, but two months later, all his money was spent. The subject was brought up but Niang and Father found out that the money had been spent on tram fares. The children were told to apologize before being allowed to receive tram fares from their parents. Although they promised each other they wouldn’t give in, Big Sister held out for ten days and her three brothers held out for another week before giving in. Adeline wouldn’t and didn’t give in."

She values her pride too much and doesn't want to beg