Or maybe she pulled it all out of her nether regions.
Supposedly she interviewed "hundreds" of sisters from across the country on a variety of topics which probably included ritual and secrets. The "shadowed" girls were all from the same school.
S and S, I looked at the houses at UVA and they don't look very big so I don't know about that prospect. I agree that the part about deferred is probably not changed because she wouldn't understand that it could be a distinguishing feature.
Edited because navane is hella good at statistics and I am not.