It may just be the picture, as she may have just done her business, I am not sure, but a cow or heifer that carries their back in an arch, is a sign of pain or discomfort. After she left the stance of the picture, did she walk with her back level? Sometimes you will hear an animal like this grinding their teeth. That is not a good sign.
But other than that, she looks to be in good health. She has a decent angle to her back leg. I can't tell about how thick she is, but you want one to have a good round belly so she can hold a lot of grass as she grazes, then she can lay around and digest it for many hours without being on the constant move trying to fill up. Often their belly won't be straight across on the bottom, but will have a bit of a bulge as it hangs down. You want her sides to stick out beyond her body a bit too. A cow with sides like a hog, slab sided, will not gain the weight they need to put a bigger profit in your pocket. The bigger bellies will weight a lot more than the small barreled one will.
A slab sided cow will pass that trait to her calf most likely.