First appearance: in Daring Mystery Comics #7
(cover-dated April 1941)
It appears she had a total of three episodes during the Golden Age (the other two were in Daring Mystery Comics #8 and Comedy Comics #9), but when she reappeared in the early-1990s Invaders mini-series, she had a . . . different look. (Well, at least now she was silver..)
from Official Handbook of the Marvel Universe: Golden Age (2004)