Does my child have the right attitude? In short, a positive attitude makes all the difference. Players that show up with a "please don't make work hard" or a "I already know it all" attitude will not benefit much. Things like "Well, I'm not very good with my left foot" or similiar phrases don't fly. That's why we practice! Also, make sure your child is open to constructive criticism. Be prepared for a lot of feedback.
What exactly is your child struggling with during games? If you're not sure, ask your coach, another parent, and ask your child for their opinion. During a session, we'll usually work on 1 or 2 things, no more. Try to narrow it down, and we will go from there. Whenever possible, I like to go observe a game before I start sessions. That way, I can give you my thoughts as well.
It's my job to educate, demonstrate, and provide an environment to improve. Then, it is entirely up to the player to apply it! It's very common for me to assign "homework" between sessions (usually only 10-20 mins. every other day). Additionally, some students lack fundamentals like agility & conditioning, and you may be asked to purchase a speed ladder to build that base. Like a good coach once told me, "Once you're fit, everything else comes easy."