Gunrunner who sends secret messages in code while playing trumpet. From "The Bedeviled Bebop" story in Superior Publishers comic book Bruce Gentry
#6 (May 1949). She plays in a South American club called La Cucaracha, billed as "Senorita Betty - El Queen de Bebop." She passes secret messages telling when illegal arms shipments are arriving in speedboats for a revolutionary army. Bruce Gentry gets wise to her scheme and helps local Lt. Gomez bust up the gunrunners.
Her pianist and partner in crime is overweight beatnik Beethoven.