Not trying to be mean, but as you asked for an honest opinion, she is pretty steep out of her hip which takes away from her balance. It will be hard to win a class with a hereford who is steep hipped, because most are level designed.
I agree she is pretty steep out of her hip and that takes away the balance and show heifer quality, but i like the last pic the best she is getting better with time it looks like though, good luck with her.