In most states private citizens don't press charges. Only the DA does, after a police report is filed.

I understand your desire for privacy, but no one is going to be able to answer this on line. This is not a DIY project. Retain counsel.

Obviously this is too complicated of a situation for this basic Q&A format. You need to retain counsel to look into a custody case.

You can get a refund. Report it to the health department.

I can't imagine you succeeding in such a lawsuit. The responsibility for what you eat is on you, not them.

The judge is not going to speak to you. I assume you decided to represent yourself. It is likely too late, but hire an attorney to review...

Lots of people threaten to sue. Few ever do. Ignore her.

You can, but none of us knows how a judge will rule. I would guess you will not prevail, but others may disagree.

No you cannot file sanctions. You can prove the "lies" by your evidence in court. That is your remedy.

Unfortunately this is not really a legal matter. Not nice, but perfectly legal.