She fixes the neckline for half a second, then looks past the mirror. That is the part people miss. The dress is already fine. She wants to know who saw the fix.
At dinner, it shows up in smaller ways. She shifts in the booth, checks the bar without turning her head, then settles only after someone looks over. The smile comes late, usually hidden behind a sip or a glance at the menu.
If no one notices, the outfit needs adjusting again. If someone does, her hands suddenly leave it alone.