We detached this subthread from https://news.ycombinator.com/item?id=10830311 and marked it off-topic.
> I deleted it because it had about -5 points.
I wonder if you're the one more concerned with the feedback and likes than your niece, and you're what caused her to delete it. Why are you worrying about the negative comments they receive and bothering them about your worries, which they then respond to by deleting what worries you? I can see an alternative view where from their perspective it was more like, "Gah, my uncle is stalking my IG and freaking out on me; deleting to make this drama go away!"
It's not that I need validation, I use social networks to help me understand how to negotiate difficult topics. If I re-read a downvoted post and I think I did a good job of expressing an idea people just don't like, I'll leave it up.