Horses Withers Higher Than Neck Line

I looked at a horse for sale yesterday and we liked her a lot. We think she has potential on what we want her to do. She is a thoroughbred. I noticed looking back at pictures that her withers are way higher than her neck line. Could this be an issue? Or is it just confirmation issues? Does anyone know if this will effect her in the future? Note she is a little unfit and needs weight and muscle on her. Vet check is this week but wanted to get everyone else’s opinion aswell. We would be using her as a barrel racer.