It may have felt like the drone was trespassing but that doesn’t mean it was.
For that matter if could have flown higher, zoomed-in on the girls, and peeped to heart’s content without even flying directly over the property. Being over you is not a good indicator that it’s watching you rather than something over that-a-way.
I don't like giving Yahoo hits, so I didn't read this whole version here, and don't know what all was mentioned, but I read this story on FR prior to today. The drone was hovering low enough to get under a 10' deck cover. It was going down a row of houses, from the backside, and appeared to be hovering long enough at each place to be considered trespassing/peeping/scouting for places to rob. Other neighbors raised concerns, as well.