Signed in the second panel on the second page.
All Gustavson credits verified and courtesy of Terry Gustafson, son of Paul Gustavson.
Last appearance of feature. There is a blurb at the end of the story that there will be more Madam Fatal next issue, but there wasn't.
Madame Fatal appears next in The Golden Age (DC, 1993 Series) #4 (May 1994)