I don't really care for the campy SG either, but I always thought she looks like a Supergirl should. I think she could play a more serious SG, but that's not what the TV show was. I think she was handcuffed by the writing and directing. I say put her in a real SG movie, but probably won't happen.
Sasha is awesome, but I don't really care for her look as SG.