No question, her boots are more important than the skis. But the next most important thing is actually the binding which attaches her to the ski. Bindings matter because they can greatly affect balance (I.e. her control, comfort and confidence). Knowing the exact difference between these two models, If you're set on buying one of these ski-binding pkgs, I'd strongly recommend the Head ski and binding combo. It has a forward binding tilt or ramp angle, that's much more middle of the road for women, than the binding on the other ski (which has over 2 times the heel height!).
Anyway, If you're not sure about her boots, I'd recommend you have her visit Drew at Viking Ski Shop on Fullerton Ave in Chicago. Great guy, very caring with new skiers. Might want to even check out packages with him before you pull the trigger online. The lowest price is not always the smartest move. Let him know I referred you and she'll be in good hands.
Regarding the skis length, for her height and weight (and most likely her foot size), I'd go with the 156 instead of the 149 cm. Her center of mass is a little too high for the shorter ski. The 156 will give her more time to react, especially in a little fresh, wet or choppy snow.
Best wishes for your trip to Colorado!