Agent X-13
Super Name: Agent X-13
Real Name: Elizabeth Ross-Mace
Nickname: Betty / Betsy
Universe: Earth-616
In her earliest recorded appearances, Elizabeth (calling herself "Betty" at the time) was a member of the F.B.I. and worked closely with the military. In 1941, Betty became involved with Project Rebirth, the United States' first attempt to create an army of super-soldiers. Disguised as an old hag that ran the antique shop, which was the front of the operation, she was charged with protecting the experiment. However, she was unable to prevent Nazi agent Heinz Kruger from infiltrating the area and assassinating Abraham Erskine which effectively prevented the United States from effectively producing more Super Soldiers..

Credit: marvel.fandom.com
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