awesome information smrobs. I was told the gullet was a full QH bar. I don't know the bar angle though...
See, that's the thing, technically speaking the "full QH bar" is actually the angle of the bars. Most tree makers do accord a certain gullet width with specific bar angles because they fit "most" horses in that size range, but not all.
For example, these 2 trees have the same gullet width, but the one on the left would be a Semi-QH bar and the one on the right would be a FQHB.
It looks to me like the angling of her back is more like the one on the left, but she's also really thick so she needs a gullet that's wider to allow the saddle to sit farther down on her.
That's why you might have trouble with saddle fitting on her. Just based on the pictures you've posted, I wonder if maybe she needs a saddle with semi-QH bars but with a wider gullet than normally comes on a tree with standard semi QH bars. I'd strongly suggest you do a tracing of her back so that you can figure as close as possible to the correct angle and width that you'll need to look for.
This site is really educational and helpful in that respect Measuring Horses For Fit
That second saddle you posted, the gullet width appears to be a little bit too much as the saddle is sitting pretty far down on her withers which could be easily remedied temporarily by putting another thin pad on her, but it appears that the bars on that one are also too flat. The top contacts her, but the bottoms angle out away from her body...like this
BUT KEEP IN MIND, I can only judge and guess so much from the pictures you've provided so I may be seeing things that aren't there and/or not seeing things that are
Probably your best bet would be to have a professional saddle fitter or an experienced horseman out to actually see what's going on where they can get their hands on the horse and the saddle to see exactly where the saddle fits and where it doesn't.