Reportedly, she was worried that Disney would "A.A. Milne" her. So she took a tougher line. She also was not enamored with Eisner, in general (seems to be a common theme..a la Pixar). So she took a tougher stance. I'm not sure you can blame Disney for not giving in. I don't think they could have made her demands work and still operate the place (and I don't mean just at a profit..but actually operationalize the things she was insisting on). I likewise understand why Rowling went elsewhere, and took a slightly more considerate stance.