I guess I am not seeing how two very popular female characters don't count just because their male equivalents are also very popular. How does that make them any less important to the DC Universe?
They are characters in their own right and have their own adventures and their own villains they fight. Have long passed being mere sidekicks of Batman and Superman. They don't even interact with
Batman or Superman that much anymore. Catwoman is more closely tied to Batman than Batgirl is. Hell, Bruce and Selina are getting married. And Mera basically has the same relationship to Aquaman.