From the description of your skiing style, it sounds like you would be well suited to a forgiving soft snow oriented everyday ski (around 100m under foot wiht some rocker to it) like the Blizzard Crush, Rossi S3, Atomic Access, etc... If you are going to have just 2 pair of skis -- then forget about Praxis Powders and anything much wider than a S7 womens or RP112 ... For the resort skier fun shape skis are purely quiver skis and you would want an everyday ski to complement them -- not a carving ski.
Also I thought Bannf was in rain shadow and does not get all that much powder on average, perhaps I am wrong. If not its another count against powder specifics...
Tromano, if a person is having issues skiing in powder, what is the easiest ski you ever used in Powder? For me it was a Praxis Powder, as long as I didn't have to ski hard packed groomers back to the lift. Knowing she will have to deal with that issue, The RX or the Protest gives her the float and smearability of the Pows, but they are more managable back to the lift with a bit of traditional side cut. If she feel those suggestions are to wide/ full bodied then perhaps the Mountain Jib in a 183 would be a better combo with her Dynastars at 135/112/130, but they will not float like the Pows, RX or Protest. If she is price conscious, the Praxis while on sale are the best pow ski for the buck IMO. If she has more cash to spend, than the DPS 112's or Lhasa Pow's would be my suggestion.
Also, if Alberta is in a rain window during winter, the Global Warmingz are on us.