None of us can answer your question based on this limited amount of info.

Yes it is illegal and yes it can still be reported..

This is not a legal matter. You can complain to corporate and shop elsewhere.

This is a common scam. Block all of them........................

He is a predator and will be prosecuted....................

Can she sue you? yes. Will she? i doubt it. Will she win? I doubt it.

Yes they can. They own the store. You can shop elsewhere.

It seems like they did you a favor by acknowledging that they were not equipped to handle your child. I see no grounds for a lawsuit.

It doesn't look like this is serious enough for the cops to get involved.

At 18 you are legally emancipated in every state.