If I understand your question correctly, it is what does the mom do who has a child participating in a sport and is worried about the risk of concussion.
The first thing I'd suggest is for her to talk to the sporting organization, talk to the coach, about what education the coach has. There are free online courses that sporting organizations give. Does the coach have anything? I think that's a good place to start.
The second thing is there's a lot of good information for parents on the Internet from groups like Parachute about concussions, how to recognize them and what's going on. The reality is, if you're concerned about the health of your child, if you're concerned about a concussion, we always say that when in doubt, sit them out until you can get a proper assessment to understand what their health status really is.