wifes face leaked at a "takeover" event by a third party who posted it

we went to a takeover at a london venue, normally great, normally tight rules. one of the other guests apparently posted a story on their personal insta from the smoking area that had my wife in the background, no nudity but clearly identifiable and tagged with the event name in the story. the third party didnt mean any harm, they took it down when asked, but their insta is unlocked and now we dont know who screenshotted it in the 6 hours it was up. has anyone dealt with the aftermath of one of these incidental leaks... wifes a primary school teacher and shes losing sleep over it