It is hard to judge by the pictures you submitted but the saddle does appear to fit her although with her build I might like to see her with semi qh bars just to see the difference. Again, it is hard to judge by the pictures but is she about 15h and about 1,000 lb?
What are the sweat marks like after a ride? Are there any dry spots when you take the saddle off? The gullet does not seem to be hitting her withers and the rear of your saddle seems to be on her back properly. It is really hard to tell but the saddle may be slightly lower in the front then I would like which would cause the back to tilt up somewhat. The cure to that is a smaller gullet saddle but I would try a buildup pad in the front first.
BTW, she's a good looking horse. Seems to be in nice shape as well.