Building confidence 10U Player

My daughter bats 4th on her softball team. She has a great eye and rarely strikes out. She steps out during games which makes me believe she’s scared of the ball and her confidence is lacking. We work on drills and when I do front toss with her she does well. She does well on the machine too. We take lessons and it all works. I’m not sure how to help her. She is strong but she usually hits singles because she cheating herself by stepping out and rolls over. We tried staggering her stance, heal up then down, but nothing seems to help. Any suggestions? We are prepping to move on to travel in first year 12’s and she needs to correct this stepping out issue. I’d appreciate some advice.