In the infinity, why is the whole city covered only when it is drenched by Kunlun Mountain? Does she think she can show it to people below?

This is the instinctive reaction of women. If you are a woman, you will understand ~

The scene of being caught in the shower is not unique to this movie. Other movies have also appeared, but have you ever seen a woman cover her nakedness with her hands? Usually only men do this, right? So this has nothing to do with "she thinks she can show it to people below"

I admire you for asking such a profound question!