she came to Titan because of Brady’s reputation which is why she wanted to work with him. She didn’t know him personally but by the work he had done at Titan and decided she wanted to be associated with him and "his" company. That’s the way I saw it anyway.
From Madison’s demeanor on the phone with this unknow person, I kind of got the feeling it was like a relative, maybe her mother or a sibling. Just from the things she said.