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All of her acquaintances at Hogwarts were reknown for their interest in the Dark Arts, including Evan Rosier and a few other students who disappeared during the Hogsmeade attack. I don't think it's any coincidence that they weren't killed, and returned around the same time as the first bodies. She also spoke highly of Bellatrix Black--"the finest woman in the wizarding world"--whom I fought at Hogsmeade. She's not a fine woman, anybody could testify to that. I'd wager it's Bellatrix Black who's her tutor in the art of pain.