Yeah, I was thinkin' the exact same thing. Cuz' I've always seen her as a type of rapist myself. The physical AND mental type of rapist. And mainly the story would be Batman figuring out the mystery of their deaths while analyzing Ivy at the same time. People are dead, but no one's broken out, and that would seem a bit odd in the Bat rogues' case.
It's a tough decision but I pick the phone records unveiling Alfred's long hidden hobbies.
Mad Hatter opens up a shady escort service that consists of mind controlled super-models
Or
Shiva decides that she wants an Heir, so she goes to Batman for the job (Heh! "Job", that's a pretty morbid term for it.)
