Basic thing you learn in criminal justice classes, if the witness has somethinn that will save themselves, they will say it right away. If they wait and then bring it up later, then either theyre covering for someone else, it will bring as much trouble on themselves (like save them from one thing, but make them guilty of somethign else), or its a false statement. Neither of the first two can apply, so...
AKA if she was below you in the room, you would have said so as soon as she posted, not waited.