I think there one more instance, in addition to the one at the burger joint you mentioned. I think the SS confiscated cell phones at a restaurant (a nice restaurant) either in DC, or during Barry's date-night to NYC a while back.
It seems to be a pattern of behavior.
She takes a horrible photograph and she’s using the power of the executive branch to stop more unflattering photos from appearing in public. That’s the bottom line to this. It’s not about her kids.