It is as much a matter of the horse's heart than anything else. A horse with a strong heart and desire to please can overcome many obstacles. Would I openly seek a horse with that horse's conformation? No. However, if a horse like this found its way under my saddle and had the heart to go on...I would welcome it.
I love the way Allison put this. It was was I was trying to say, but Allison managed to put it better.
I have had many wonderful horses with less than ideal conformation, but becasue they loved their jobs, they were successful, and a few conformational beauties who were duds performance wise because they lacked the desire to please and the attitude.
I think analyzing conformation and what makes a equine athlete is fascinating; but conformation does not write the horse's destiny in stone: conditioning, training and heart all are factors.
I also agree that you can do a great deal with conditioning and training to improve her topline, and that's where I'd start.
And when she makes the cover of COTH, I'd also like a copy.