I wouldn't completely write off the old, all wood Yumis or Kamas. The titanal band definitely makes a big difference in how the skis feel, especially their dampness, but depending on how fast/aggressive she skis, the all wood ski might be more than enough for where she is at right now and may even help her improve more than a stiffer ski would.
I owned the old Yumis and have the current ones w/the titanal band, both in a 147. I'm 5'1" and about 100 lbs. I picked up the all wood Yumis when I was probably a high intermediate skier. I was consistently skiing a lot of black diamonds and getting into more ungroomed terrain at that point. I used those original Yumis for a few years before I started to find their limits (for me). It wasn't until I started really picking up more speed, and I'm talking a lot of speed at the bottom of a fairly steep black, where they started feeling squirrely. So unless she's going mach-chicken, I don't think the titanal band is really going to be a huge factor one way or the other with regards to the speed limit for her. My skis are also shorter proportionally to me than hers would be to her in a 161, so the extra length should get her some some extra stability at speed compared to my skis.
The biggest difference the titanal band is going to make is in their dampness in crud and choppy snow. And it's a big difference, or at least it was to me as a lightweight. The all wood skis get tossed around A LOT more than the titanal band version. Just adding that little bit of metal, in my opinion, did a lot to help the ski bust through chopped up stuff better, or at least it smoothed out the ride. That being said, the all wood version forced me to find other ways to deal with that choppy, crappy snow, which was to keep the skis on edge through it. If I put the skis on edge, I never had any issue avoiding that getting tossed around feeling. And in some ways, I think that probably only helped my skiing improve. The all wood skis will also be easier to flex and so might help her carving skills improve more than the stiffer version would. I actually owned the Kenjas prior to the Yumis and going to a less stiff ski did a lot for my skiing. Granted, the Yumi with the titanal band is still nowhere near the stiffness of the Kenja.
FWIW, I took my old Yumis, even when we were approaching the end of our relationship, down Pearly Gates at Snowbird. So just b/c they're lacking metal doesn't mean they're going to be a limiting ski. Just food for thought. But you can't really go wrong with either the new or old version. It's a great ski for a lightweight.
