Miss Moneypenny is `M`s secretary who secretly wishes she was Mrs Bond rather than just a face in the office. Prior to Skyfall, Miss Moneypenny has had only a small amount of field experience, mainly to pass information to James Bond.
In Skyfall, Miss Moneypenny`s first name is revealed to be Eve. She is also revealed to have been an agent at one time but after the disasters that happened in Skyfall, she decided to get a desk job instead. I think we will see more of her out on the field now in future films but there`ll still be another female character who will take central role though.