My hypothesis is that she was an habitue of this place, as also was Mrs. Vernon.
It is enough to mention Mrs. Farquhar's name to an habitue of the Springs.
Especially, I would say, is this the attitude of the habitue of Montmartre.
Once he found Rodney Page there, lounging about with the manner of a habitue.
But this type of European never becomes an habitue; the habitue ...