Celeste Help

I enjoy playing Celeste but I’ve never had these crazy games with her that I see people doing. I’ve only really had consistent games with her, like a few kills, a couple deaths, and a good amount of assists. However some games when I don’t get Celeste and she’s on my team, this person is going off. On top of that I always hear people saying how OP she is, so it’s definitely makes me think I’m playing her wrong.