Now that they had acted together against Emerald Owls, it was only natural that the faction would extend invitations to not only Mary, but Electa and Jane as well. So, while talking to Lazarus, Liam had no problem to get the man's invitations to the three women. Mary accepted immediately, while the other two would hear it later.
Once that was settled, Liam gave Mary the Guardian Sphere to use in the meantime. He was now in the third realm and wouldn't need the item as much, while she would now be in her most sensitive moment within the sect.
With that settled, a member of the faction took Mary to register with the group, leaving Liam alone with Lazarus.