Maybe the Gates had more mojo than people realized. Or maybe she'd piggybacked out with something that had been summoned by some idiot who thought they were better than silly old law of magic that said 'thou shalt not reach beyond the Outer Gates,' and all that jazz. Or maybe someone had yanked her out, and was just letting her have a little fun before they reeled her in--but if that was the case, her mysterious benefactors had yet to reveal themselves.
"Well, it seems like someone's already started raising hell without me, so I guess my plan is to get in on the action wherever I can." And hopefully not get pawned by some big shot demon, or demon-hunter, in the process. But that went without saying.