Your position is understandable, but it might be good to have her stay with her team. She will learn valuable lessons being on a team. How you handle her feelings will determine if she is willing to approach you in the future about trying new activities.
Help her see what she is gaining from the experience. If she starts to break down and fuss about playing, remind her that she is part of a team.
Quitting isn’t good because she agreed to help her team. Teammates help each other learn and be successful. Friendships develop on teams, so focus on that element rather than the sport.