Or was it three? Hmmm, was it before or after BRiTF that V starting sending to Serini? My guess is after Roy did for Girard's gate but am happy to be corrected.
It was definitely before that; there is a bonus strip in BRitF that shows it.
There is also a possibility that her "warehouse" is protected from receiving Sending, but that seems to be unlikely.
There must be some sense of order - personal, political or dramatic - and if no one else is going to bring it to this world, I will.