I'm not a fan of how her withers and neck tie in to eachother, but that's merely opinion. I don't have much experience with Saddlebred conformation.
Otherwise I think she's lovely. I don't really see the roached back though. I'd personally like to see a lot more muscle in that hind end, but that is a conditional thing, not conformational. What a beau!
I think she may have a combo of that "Saddlebred Sway" (at least figuratively, if not literally ie genetically), and a short back, which makes her look kinda funny. She is gorgeous, though, IMO. Her Araby croup is kind of flat which may make collection harder for her, but not impossible.