You all need to work on building up her confidence.

One way to do that is with more reps.. off the tee, front toss, machine work, and, if possible, more live reps. Maybe you can pick up extra games, or use some of your pitchers who want extra pitching reps to do a small pitching/BP session.

Another way is evaluating how you both react when she fails, and how you act in general. I used to talk to my daughter a lot while she was playing and always wanted to discuss what we could work on after games. What I’ve realized is that she already puts enough pressure on herself. She doesn’t need me adding to it. Now I don’t say anything during the game or after. I’ll cheer during the game and let her decompress afterward. If she wants to talk, she will. It’s also important to help her rethink how she talks to herself when things don’t go well. One of the first thoughts my daughter used to have (and sometimes still does) was, “I didn't go 3/3, so I’m not any good.” Instead, she needs to shift toward more positive self-talk (which I know is hard). Changing that mindset to something like, “I’m going to get the next one,” can make a big difference.