By the way, what Misa does and doesn't know about them is rather strange because she was taken from during being kidnapped and was only filled in a little bit by the previous DN crew >.>; She was actually friendly with the previous Matt, doesn't know Mello, was warned about Near by Light, and Rem told her about L. And she knows Light was killed but is trying to block it out >.>;

Sorry for the tl;dr but I just wanted to give an explanation for why the way she acts might seem weird.