*Sigh* Yet another prime example of an "American Warmblood" - mash any two slightly drafty and slightly hotblood horses together and TA-DA! Warmblood!
Her back isn't great. It's long and between the Saddlebred back and the Draft butt, she's not going to be a particularly nice looking horse - not to mention her gigantic roman nosed head. Anyways, I would not say that this horse has a sway back. She's in the weanling fugly stage, and will continue to be in that growing and fugly stage for the next 5-6 years.. then you'll see her true stature. You'll get a good idea of what she'll turn out like right around her 3rd birthday. I wouldn't hold my breath for her to be anything other than a low level horse.