Maybe she forms a special friendship with another girl in the class who is very open - minded. They study together, share secrets, and the gay girl starts to feel more comfortable in the new environment. Their friendship could also face some challenges, like when some students start to spread rumors, but they overcome it together.
One idea could be that the gay girl in the class is initially met with some confusion or mild prejudice from a few classmates. But as the story progresses, through her kind nature and unique perspective, she wins over most of them. For example, she might be really good at art and uses her skills to beautify the classroom, which makes her more accepted.