Read the extract and answer the questions that follow.
September kept her window open day and night so that the little bird might come into her room whenever he felt inclined, and this was very good for her; so she grew extremely beautiful. And when she was old enough she married the King of Cambodia and was carried all the way to the city in which he lived on a white elephant. But her sisters never slept with their windows open, so they grew extremely ugly as well as disagreeable, and when the time came to marry them off they were given away to the King’s councilors with a pound of tea and a Siamese cat.
How did the open window help the princess?