I don't know your daughter, so it's impossible to speculate or offer a solution. These are guesses. I would ask her about what she thinks is going on. Maybe a coaching change is in order. Go back to basics and have her throw only fastballs. Pitching is very tough. I was one and both daughters pitch. Finding guidance at the top level is very difficult.
Also, does she see a pitching coach regularly? Coaches are really good at screwing things ip
Also, does she see a pitching coach regularly? Coaches are really good at screwing things ip