well personally my gf started on an alibi rogue but once she started to link turns and i knew she was serious, we went board shopping and she picked up a never summer pandora. its a board that can help her learn and that she can keep progressing on. its slightly more park oriented (really just softer flex) but she really likes it.
also gnu ad roxy make nice boards for girls
Never Summer Evo 153/Restricted ReFlex Cartel
Gnu Danny Kass 156 BTX
I just got a GNU Pickle and can't say enough nice things about it. I am intermediate, about 5 years into this now and my first board was a Salomon regular camber style. The Pickle is a rocker which makes turning effortless. I matched it with Flow bindings as I hated all the time on my bum strapping in. Its made a huge difference to my time on the slopes - I am now waiting for others instead of the other way around.