The problem here is not with the teacher but is rooted in our feelings of jealousy. You should speak positively for the girl who has been selected in the project and see her positives. And then we should also pray for her thinking, as she has performed really well she has been selected. By doing so that talent shall blossom within us and in future we too shall be selected. But by being jealous we tend to become weak minded and lose our inherent strength. So henceforth always think positive for both the teacher and that girl.