You are just helping out as a "Coach."
BUT there is a formal "Coach" coach, in charge of things, right?
So why don't you speak to the Coach, about it.
In any sport, "sportsmanship" is taught, and per attitude etc.
Do they teach these things to the students?
The thing is, you can't control other people's attitudes, and it seems the parents as well as those jealous girls, are complaining and resenting you and your daughter. BUT, they are causing hurt feelings, especially to your daughter.
You can explain until your face is blue... that you do NOT do any practicing at home nor do you even have equipment at home and that you do not even have a big enough home/yard to practice. But the other "jealous" parents/kids, will still think ill of you and your daughter.
AND they have bad attitudes about it, and they now do not even listen to the Coach, either. That is THEIR problem.
They have, bad attitudes. And they are using you and your daughter, as an excuse... for why they do not get better.
Bottom line is, you speak to the formal Head Coach, and being that all the other Coaches back you up... wouldn't it be common sense, that they have a meeting with the group, and without naming names... TEACH THE GIRLS ABOUT SPORTSMANSHIP and attitude???
Because, like anything, it is the Attitude and work Ethic, of a person, that gets them ahead or not.
Kids need to be taught that. It applies to sports/teams as well as academics.
Don't get into it with the other Moms/their kids... because, they will just twist things around and still blame you. And your daughter.
They have stinky attitudes and are, jealous.
And besides, just because a child has a parent that is a Coach... that does NOT mean, that the child will be talented in that sport.
The Coach needs to coach.. which means, ALSO teaching the girls about sportsmanship/ethics/hard work/and attitude.
Even with Professional Athletes... if they have stinky attitudes on the field, they are reprimanded.