possibility for one of the following
1) If you already completed convincing them but option didnt turned green, like it should had possibily a bug (ignorable won't affect further game play), so go trying going to meeting room at morning, should trigger the second event.
2) By seven girls it refers to first seven girls before the assault, make sure you haven't confused with Maeve, after all she also appears to have a room in exile. (Check in all 7 girls cards to see if all their hint says after the meeting) Also, you should talk to them in their rooms atleast once (if you havent already).
Thanks, That did it.
I kept getting little affection events in the morning like jogging and picnics, so the earliest I had tried was noon. Ignoring those and going to the meeting room first thing finished the quest.
Usually the ones that don't state a time are at any point, so I thought it was the "Girls' Meeting" option that shows up there.
Joggings and picnics are only on sundays, if you had tried other days, the result should had been different (there are few events specific to a weekday, just like there are time dependent events).
But again, did you get Shiela's picnic events even before the girls meeting... Shiela only joins exiles during the meeting!!!!!