Vanilla is a product of Lussumo:
Documentation and Support.
Alice also seems to know all about the Freakangels' abilities, she was aware of this even before she showed up with the shotgun. I wonder how many other residents know who they're living with.
Also I think as they are constantly living in each others heads if Conner's got a thing for her they are going to have to accept her. Luke and Sirkka non withstanding (because one is a fuckwit and the other it has been stated has a different set of priorities in rebuilding the world) none of the other Angels seem to have very close relationships with anyone but each other.