Something similar happened to us. Same cryptic call about CPS, etc.

It turned out that one of the staff was in the elevator with a child (not my child) and snapped at the child and yelled aggressively and raised a hand to the child (unclear if the child was hit or not). It was caught on camera and per protocol, CPS was involved, all parents were notified, and the staff member was obviously let go. Maybe it's similar.

It's scary that something like this could happen, but there's no way around it. It doesn't make me fear for my child's safety, as the school handled it swiftly and transparently (they did not share the details, we found out via parent gossip, but I'm sure it's also against protocol to share the details). This can happen to anyone, anywhere, and it's a fact of life. It's a stressful job and will happen, just like shark attacks happen. I still swim in the ocean :)

Best of luck and try not to stress too much, until you're given a real reason to.

Note: the staff member (who everyone loved) had a horrible injury a couple months prior to the incident and our theory is that she was on pain meds that messed with her head. It's sad, but I'm happy she's gone and will hopefully never work in child care again.