She should be in Skull Caslte (unless you have a dodgy save file). Go to that room full of water with lifting walkway sections. Head off into the Western opening (left as you enter). In this area head straight ahead, down some stairs, ignore the room, keep straight ahead untill you come through an archway and up to a wall. There should be a pool of water to you're left with a chest in the corner. To you're right should be some stairs going up. At the top of these stairs is a locked door (needs the Lich's staff to open it) and on the other side of the door should be Madda Mabbig, if she's not there then you've probably got a bug or dodgy save file.
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