You’re thinking is right on with the LTech’s. I think you could easily fit her into the LTech’s. My philosophy has always been to fit juniors as you would anyone else – based on there physical stature, strength, ability, etc. Of course, starting out, you want to be sure the clubs are not too long, or too heavy. The great thing today is that the shaft can also be fit well because of the options in graphite, and even steel, that are lightweight and flexible. Ralph was the original author of a junior fitting chart that based lengths on a juniors height and weight, but even he would tell you that that was meant as a guide only and intended to give parents and club fitters a starting point. Good fitting basics and good judgement, along with communicating with the junior and asking them if they feel comfortable with the clubs is very important.
Hope this helps.