The swing weight on skis these days is insane... The longest skis will still be light as shit.
I'm a 5'4" female and I ride 171 park skis and 176 pow skis... I've ridden my boyfriend's 185 pow skis and man handled the fuck out of them. IMO you can never go wrong with too long... More support, more speed, more pop, more height. More everything.
Shorter will make you limited with everything.
LONG FTW!