The main thing any reader or parent should take away from this thread is Softball goes by quick...The Organization if they have been around should know better than accepting 6 year olds for 10u teams.
Putting any young lady on a 10U travel team at 5,6,7,8 is a good way to get your kid hurt and hurts their development. Go to any 10U event and watch the teams, on most teams there are a handful of 9 and 10U ladies that struggle with the ball size and playing equipment. I see on the team looing several 8U teams looking for players. IMO, Parents do not risk hurting your kid or giving the burn out at 12 trying to get them playing above their maturity level. If you do want to look at an 8U team ask good questions about the coach and team...
What is their experience with working with this age group. Do a quick review of 8U playing rules. Use this to ask relevant questions to see if the coach knows the rules. If they cannot answer playing rule questions they most likely do not understand the other areas needed when building the foundations of players this young.
Ask the coach about tournaments, If they say they plan on a couple 10U events walk away...Kids this young should also not play more than 2 games a day.
IMO, Save your money, At 5,6,7 sign them up for a coach pitch league that uses the proper size 10" safety ball and let them have fun.