In what type of tree? What brand?
Did you just do the templates, or did you actually try a saddle on her back?
There aren’t “standards” in the Western world of saddles. One saddle maker may call their tree semi-QH bars but it might fit like another makers full-QH bars.
Gullet sizes can be different. Bar angle can be different. The rock, the flare, twist, etc etc, can all be different. And that will affect the saddle fit. While it is a starting point, there’s a little bit more to it than to see my horse needs a SQHB tree.
http://saddlemakers.org/id193.htm
http://www.rodnikkel.com/content/tree-and-saddle-fitting/factors-that-affect-tree-fit/
Your best bet is to go to a local tack shop with your horse, and try on saddles. Then you can see how it fits your horse, and how the saddle feels to you.
If you don’t have a tack shop like that nearby, then look for online websites that will allow you to return saddles. Beware, and some will charge re-stocking fees. Of course, you will have to pay for shipping both ways.