So I work in a high school (kitchen staff, not teacher). My manager is currently away on holiday & one the kids (15 y/o boy) asked were she was. When the break was finished two other staff members were cleaning up the lunch hall and overheard the 15 y/o boy telling his friends about how my manager tried to follow him on Instagram. Member of staff asked him to repeat what he said and he confirmed she tried to add him & denied the follow.
We have very strict social media rules (local council) and are not allowed to contact any of the children, take pictures etc so I know she crossing a very big line here. It's not the first times she's been quite inappropriate with the kids, she puts her arm around some of them, calls them sweary slang names and asks them about personal stuff/gossip.
What I'm not sure on is, how can I report this? I can go to a manager above her but then I don't want it to fall back on me as I still have to work face to face with this person daily. Any advice is welcome. I 100% want to report her for this as she's gotten away with so much.