Club soccer makes a big difference in the girl's play. It does take some extra money and a large commitment from the player and parents. My daughter does and loves it. She quit softball to do it, but had no regrets.
The biggest issue I find in the rural schools is that over half of the team will have girls that play multiple sports at the school. They can't fit in club soccer as it conflicts with basketball or softball. I know it is an issue in our area and surrounding counties. If they play AAU basketball or travel softball, it can be expensive also.
I do budget this as it is not cheap, but not overly expensive. I sometimes use a tournament weekend as a vacation, but the girls might not see it that way! It is worth it to watch her play and improve, but I know not everyone can afford it or find a team to play on. Just my 2 cents.