Zursch, last year my wife got a pair of Volkl Luna (103/72/117). She is about 120 and 5'1 and got her the 149cm. Would rate her level as a 7-8. While were live in Maine we got them when we were in Vail. They were just perfect for boot top powder and packed powder. Back east she found them very stable and solid on hard packed. She is not an aggressive skier but has excellent, modern technique. Perfect ski and size for her.
I checked out the Aurora - considerably more ski all over, though same radius. Best advice is always to demo. I suppose if the shortest that is available in that model is the 156cm then assume it would be suitable for a woman your wife's size. But the dimensions look to me to be a ski that is more for soft snow/off piste where you would want more flotation. If you are in the East, 156cm may be a bit of work. Depends also on the configuration of the ski. Look at it carefully to see if it has an upturned tail. If so, that ski will ski shorter than one that does not.
You may want to check out the SkiDiva site. Must be some ladies there who have skied it.
Good lcuk,
Davidf
