Vincent, "Sybarite" is a type of Brute, which is very specifically a whole group of people per the rules. Would this lone employee be a Brute: Sybarite by herself, or would all the blue paste addicts in the holding be Brutes: Sybarites? If the other employees are good and loyal (or at least only fucked up in other, unrelated ways), then it doesn't make sense for the Angel's crew to be Sybarites as a whole. I mostly grok the threat system at this point, but every once in a while there are edge cases like this that throw me, so your insight is really appreciated.
I think I probably would have slotted this person in as a Grotesque: Cannibal, myself, since it sounds like the main way she threatens the PCs is by putting her addiction ahead of her other responsibilities (craving satiety). If she was a threat because she started introducing the drug to other characters, she might be a Disease Vector, where the disease is addiction (which, yeah, is probably an affliction of some sort on its own). Promoting her to a Warlord wouldn't have occurred to me, but I bet whoever's pushing this stuff is a Slaver.