Stockli Rotor 70 in 159 cm - 118/70/103 R12.2 - multi condition
or Stockli Spirit Ed VII in 157cm - 115/68/98 R13.5 - carving (my wife skis this one, she is 5'9", 130 lbs, level 7/8)
Spirit Ed Got great reviews http://www.ts2003.com/members/index.html
See 1 Ski quiver reviews for women (rated for Pro & Expert)
As your wife is quite petite she is getting float from a 68mm waisted ski that a larger skier is getting from a 75-85mm waisted skier. It is all a matter of proportional surface area to weight and leverage (ie body length).
Note that Stocklis are not light skis (they are not heavy but they are not a foam cored Salomon) but light and excellent edge hold (torsional strength) and ability to deal with changing snow conditions are almost mutually exclusive anyway.
edge angle is an important factor in hard snow performance but I assume you have got that covered (Stocklis come 1/88 anyway).
For your priorities the Spirit Ed VII should be perfect.