In Girls' School, the heroine's feelings for Dong have experienced some twists and turns. In the early stage, I didn't like Dong, and even had some disdain and disgust. However, with the passage of time, especially after experiencing similar things, I gradually let go of my prejudice against Dong and began to have a good impression on him.

Specifically, the main points of the views on Dong Zhibian include:

1. During pregnancy, Dong showed firm support and care, which made him feel his sincerity and care.

2. In the face of others' misunderstanding and attacks, Dong always guarded her, provided her with shelter and support, and began to realize the value of Dong.

3. When she gradually integrated into school life and had more contact with Dong, she began to find Dong's advantages and charm, and gradually developed feelings for him.

Therefore, it can be said that the feelings for Dong are gradually generated and deepened through experience and getting along. Although the specific time point is difficult to determine, it is certain that in the course of the development of the story, I gradually realized Dong's goodness and finally fell in love with him.