Thanks for the community info!
I expect that at least one of the parents reported her absent for several days. I’m not sure how long the Thanksgiving holiday extended at her school…lots of people travel then, and kids are often out of school even past the official school holiday schedule. But they are obligated to provide proof at some point (in my state, it’s after 5 consecutive days), like a note from a doctor, justifying an extended absence. The school was probably hounding them, which is why the parents went there. If they had no documentation supporting a legit reason for the absence, the school would have no choice but to bring the matter to the attention of authorities, be it truancy court, youth services, or something of the like. School resource officers often know their local PDs well, so I expect that if the resource officer was suspicious of the parents, the PD would be a natural avenue for him/her.
MOO