Would be a good size. I wouldn't go more than 125cm if you are going for a SL ski; my daughter currently outweights yours by nearly 20 lbs and I think the 125 will be perfect for her next season. Note the SL skis are both heavier and much stiffer than what your daughter is currently on....significantly.
Our older junior racers suggest the Volkl line to be a bit of a stiffer one in junior skis (Atomic and Fischer being the stiffest). You might also want to look at the Nordica/Blizzard line in a 122cm. A bit softer than the Volkl.
You can also ask around your club and talk to the coaches and see what they suggest. There are a couple strong girls that I've seen that are using the Nordica/Blizzard 122 SL, these are also the girls shinning and ripping through the stubbies when they race (winning by over a second in 25s races). The Head ISL RD JR in the lower 120s is also a softer feeling ski.
At your daughter's weight I would highly consider the Fischer RC4 Superior in a 120 length. My daughter was around your daughter's weight at the beginning of last season and the ski was perfect for her. https://www.fischersports.com/en_en/rc4-superior-jr-4335
It's a real deal race ski, sintered bases, full sandwich construction, full sidewall, air carbon core.....just no metal. Concern of course is you might only get the one year out of them during the transition period....but in my mind better than putting her in a ski that will be too much of a challange to ski. Again I've never seen your daughter ski so have no real point of reference.
My daughter's new skis (Fischer WC SL 125s) are WAY heavier than her 120 Superiors because of the metal, more wood and race plate. For a performance perspective (not that it matters given their young age, but mainly for a reference point) my daughter was posting times a full 2 seconds faster than the 2nd place finishers in 45s courses (and those other girls were fast as well, often the 3rd place girl would've won gold in the boys event).
Keep in mind, any real race construction ski is going to be VERY different for your daughter to ski on and there certainly will be an adjustment period. The route I'd choose will be dependent on how agressive your daughter skis and an honest assessment of how she carves her turns. Does she puts the ski on edge and ride it or does she put her ski on edge and tries to bend it in half to pop her into the next turn.......
As mentioned a tough age as you are needing more ski, but perhaps not quite there for a full blown SL race ski.....I found that Fischer one to be prefect during my daughter's transition period. She used it for the past 2 seasons.....looking back her first year with the ski might have been a touch much, it was only this past season when she got bigger and started getting really agressive with her turns where the ski came alive for her. Seen lots of successful young racers on that ski, a few of our boys (consistant podium finishers) will be sticking with that ski next season (age 8 next year as well), they will also be around your daughter's weight.
Don't feel the need to HAVE to put her in a SL ski, I maintain that you should only be looking at them if your child is a very strong skier than can really crank turns. As ski that is too stiff for them to bend will hinder their ability to properly carve and work the ski. As already mentioned ski federations don't even recommend SL skis until U12 (10-11 years old).
As for boot, at her size boots are pretty similar. Even "race" boots tend to be more cosmetic at the softer flexes. The most important thing is for her to be able to flex and load them properly. I'm guessing she's in a 40-50 flex boot (keep in mind there is no universal standard in the flex rating)....I find once you move to a 60+ flex boot you'll find you pretty much have to go with a race boot given the availability of those stiffer boots in smalled mondo sizes is just are not there if you don't. Again another area where I've seen too many parents put their kids in too stiff of a boot, if the can't flex them in the cold they are no good. For what it's worth I see most kids in a Lange RSJ 50 or 60 (or Rossi equivilent) boot. My daughter used the RSJ 60 last season and it was great for her and will try to keep her in it for next season (we will see if her foot grew over summer!). If not and we need to buy new boots, we'd be looking at the RSJ65 for her.
Edited by hbear - 8/9/16 at 3:15pm