yes you can steal home in 10u A ball. I don't remember if they passed the rule for B ball to steal home or not.. it's been a couple years since we have been in 10u...
the knuckle change is a awesome pitch that's what my daughter throw's also and yes it is a offspeed pitch, she also throws a knuckle backdoor that works great also..
sounds like she's droping her shoulder. Or hands are way behind the hips. You may want to just go to contact and see where her hands and hips are..we work that a lot off the tee, then go to full swing..
In our league it's 3 pitches from the coach and if they don't get a hit off the 3 coach pitches, then they get 2 swings off the tee if they miss both them then it's an out...