Do you know if she actually does see her posts? Just because she can doesn't mean she does.

I have a facebook account, but I haven't been online in months. It's just not popular in my age group anymore. When I do use it I only look at my groupchats and 5-6 specific profiles to keep in touch with people who live far away from me and are active on facebook. I don't look at my feed or whatever. Last I checked I had like 60 notifications, I'm not going to look at them. I'm just hoping no one's handing out my personal data and hope anyone who's close to me would tell me if they did

Anyway, I'm sure your niece is very active on facebook and carefully monitors everything that happens on there, the statement that she can see the posts just doesn't mean much to me