If you have the resources, you could also serve her with papers. IANAL, but that arguably is libel, defamation, harassment and so incredibly insane that it deserves a severe legal smackdown.
Not sure I’d want to rope my kindergartener into something like that? I like GP’s approach
So their child was accused of 3D printing a gun and taking it in to school, the parent confirmed online that, yes, their child did 3D print a gun and take it to school ... I'm not sure what you're hoping to achieve.
It's not libel, it's a misunderstanding.
US lawsuit culture is absolutely insane.
What are your damages? What kind of remedy do you seek?
Judge will throw it out unless you're well connected. They'll say the case has "no standing" unless you shell out massive amounts of money.
No, that is not even remotely close to qualifying for any of those things.
The principal merely said someone made a call about it, they didn't present that claim as a fact, they didn't publish it, they didn't act with malice or negligence, and they caused no damages. A statement would have to meet all of those qualifications to be libel or defamation. It meets none.
Harassment is repeated or continuing communication that serves no purpose other than bothering the person. This was a single phone call was made for the purpose of investigating an alleged school incident. It meets none of the qualifications to be harassment.
Our laws do not prevent anyone from discussing claims by other people that may or may not be true. It would be silly if they did.
There is absolutely nothing illegal nor unusual for school staff to call parents to investigate concerning claims made by other students or parents. Doing so is exactly how misunderstandings in these situations are cleared up.