We have gone through this a few times. First, about where you are. If I paid for the season, we're going to try to make it. However, if she hates it, then figure out why, and if it's reasonable, then let her.
Second, it was a hip injury. She almost didn't come back. Shy cause of a scar and had to catch up allot. But she went back and did the work. She stayed.
Third time, more recently, it was a coach thing. She wanted to move gyms, but I've paid the monies, have the expensive uniforms, etc. I nearly let her quit, and did inquire of another gym, but she ended up resolving it with the coach, with my help, and falling on my sword to do so, but some confidence coaching as well as how to talk to adults, more suck up and fall on your own sword, fixed it.
This is complicated and it's multi factorial. I do believe that the relationships made and the commitment skills learned and the perseverance skills are useful throughout a lifetime.
However, It's you and her. You can't make her do this. If you MAKE her, she's going to get injured cause her heart isn't in it. We don't want that. Try to bridge it and see if the team mates can get her back into it, and if not, allow her to step back. Sometimes a break will do it, but if her heart isn't in it, you can't make it happen. You have to let her let it go. That's my opinion anyway.