Origin
The girl who’s would become the Red Widow was abducted by the Red Room at the age of 7, where she was starved and tortured into becoming their newest assassin. Red Widow was appointed as a member of the new Winter Guard, where she actually calls the shots from the shadows despite Crimson Dynamo being the official leader.
Creation
Red Widow was created by Jason Aaron and Ed McGuinness and first appeared in Avengers Vol. 7 issue 10 (or the 700th issue of volume 1).