Yes the conclusion was that the 158cm probably where too long. She used them 4-5 days this season, tried to convince her to try her little brothers 148 cm of the same type that he completely refuses to use (also oversized). But she wanted to use HER skis so, at least she has bonded to them ;-)
At one point she was going down a slope a bit to steep for her taste, covered with deep a bit heavy snow. She tried to force the skis around in Z-turns or forcefully wedging in protest. And her knees also screaming in protest... When the slope mellowed out it was ok.
Hoping that she learns to really carve her undersized 131 cm SL during the indoor season, then move her to appropriately sized 138 cm SL, learn to be able to use er new 157 cm GS without beeing afraid of the speed some time after new year. And then perhaps the 158 cm mantra's will not be too much anymore sometime next season