This is so hard to teach. That agressive killer nature I feel is in a special group of kids. I have had a few and have had the other side of girls who are lost in the box. I would love to have that agressive anything close its crushed but find it is very hard to come by at 10u
I think many are born. But I actually think it can be coached.
My wife has NEVER asked girls to look for walks. She never even mentions getting walked. We only talk about hitting the ball. I think too many times players are told good job when they get a walk. Not saying you should ever swing at a bad pitch or not take a walk. I am only saying that you must be very careful with kids. They often want to make us happy and be successful. And at 10U the wait for walk kid can easily get the wrong idea.
Always encourage hitting and discuss walks as an unfortunate at bat when you did not get to hit. At 10U my wife would often have girls swinging at the 3-0 pitch. She does not want them looking for a walk but rather always thinking attack. At the end of the day it is always easier get them to taper back. But I have seen kids that never really get the motor going. Unfortunately, sometimes you must thin the herd.
Actually, I have a 3rd DD who is an 11U who just started playing. She was never really interested and so we never pushed it. And she is wired the same way. It has taken us this long into the season to have her taper back. She easily leads the team in going down swinging. But this past weekend she hit 6 line drives (4 for hits) and had a walk. So she is on her way. Her mother came to watch Sunday and she got walked and ground out and cried on the way home because she did not get to show off her hitting, she felt she had a bad day.
So I can only suggest that at 10U you MUST stop worrying about winning and worry about wiring. Get them thinking hitting and attacking at all times. I cringe every time I walk by a 10U field and watch a girl get walked and hear the crowd go wild. Like the batter did anything. She got on base by doing nothing. That is hardly a reason to celebrate IMO. Go crazy for the hits. But for the walks just clap quietly and tell her she will get her next time.