im not really a big baseball or softball person but maybe she is just nervous because there is boys on her team. If i was her Ii would be nervous because I wouldn't want to do horable in front of guys. Maybe try to help her because she might be really nervous... I would. Hope this helps and makes sense.

Just give her some one on one help. Look up some batting camps and recommend them to her. Just don't give up on her.

Take a lot of tee and soft-toss practice.

How does playing softball before baseball have anything to do with her hitting?

If she is young, under the age of 12, she probably just needs for experience. You could urge her to shorten up her stride, maybe suggest a quick foot up, foot down, like Paul Molitor used to do, instead of a stride. She might also be ready for a heavier bad so her swing doesn't beat her stride.

i dont really like baceball or soft ball but i dont know