“Sadly I can believe their story having seen first hand what can be done to parents who decided not to send their child back to public school but enroll her in a private school instead.”
There are 5.7 million children happily attending private schools in the US, so there has to be more to your story.
Parents enrolled their child in kindergarten. For various reasons, mostly having to do with the teacher, the child failed to thrive there.
Parents decided over the summer to move their child to private school.
Public school decided that since child was not re-enrolled in their school that she was "Truant".
SRO gets involved. CPS is called. Parents are forced to let the CPS see their daughter and talk to her. They are told to appear in court. They do and are told the case is dismissed.
A year later the case comes screeching out of it's grave and they try to arrest the mother. Case goes to court and is dismissed again.
Following year she learned that CPS is digging into her children's medical records including those of her oldest son who is of age.
If I was not involved in it personally I would think it was nuts but I was there for most of it.
Sometimes while just going about your life you run across a bureaucrat that takes you in dislike. Things can quickly go down hill from there. And once you are in the system it never goes away.