Evelyn in DW is what's referred to as an "audio companion" - i.e. she was invented for the Doctor Who audio plays produced by Big Finish, which don't have to content with some of tv's limitations (such as budget, aging of actors and ageism of the audience) - and she's an awesome 55 years old historian who decides to travel with the whacky alien who's the show's hero. (Well, if you were a historian and you met someone who could travel through time and space, wouldn't you?) So your mother's name is anything but disgraced:)