I'd like to see just one girl whose main role isn't to be the princess or the girlfriend.
They're making a bit of headway with Uhura.
Perhaps they can make Carol out to be the great scientist she was in TWOK.
For me this is the problem; Uhura in particular does some brave things but (to me) they came across as secondary, partly because she's a secondary character and partly because her relationship to Spock got more emphasis. For me to call her a heroine that'd have to be her primary function in the movie.
If you do heroic things, you are a hero/heroine.