She sees without doing that too, if you destroy the CCTV camera on one chapter, she will comment without having seen you do it.It only happens when she goes into trance mode (white eyes). In that mode she can see through Aiden directly. Otherwise she is relying on what he tells her. She does that because she needs to copy the documents. But it hurts her like hell, that's why she isn't doing it for most of the time. It presumably hurts Aiden too because of their connection, so she can use that to force him to do something. But since it hurts so much she uses it very sparingly.