To echo what GoingDeep said, you need to have a clear idea about your DD's goals. And, then her goals have to be tempered with reality.
My DD#1 played on with an upper level 16U team at 13YOA, but she didn't play much. She moved to a less competitive team, and pitched as much as she wanted (which turned out to be almost every game). She loved it and she learned a lot.
Softball is to be played, not watched. If your DD is going to sit the bench, then find another team where she can play as much as she wants.
My DD#1 played on with an upper level 16U team at 13YOA, but she didn't play much. She moved to a less competitive team, and pitched as much as she wanted (which turned out to be almost every game). She loved it and she learned a lot.
Softball is to be played, not watched. If your DD is going to sit the bench, then find another team where she can play as much as she wants.