I finnally got around to reading this one. Ya, the pasture in the first photo was over grazed a lot. I run a lot more head of cattle on a pasture that size, for about two weeks in a year, then the pasture gets the other 50 weeks of the year to recover. You shouldn't see the grass that short. The tall sprigs... that's stuff the cow doesn't like the taste of, and is of poor nutritional quality.
That poor cow needs (as was mentioned earlier) groceries. I wean calves earler than at yearling age, and that helps the cows to build the pounds back up. As mentioned earler, that calf has sucked much of the fat right out of that poor cow.
I looked at that body condition scoring chart. That was pretty helpful, I rate this cow at about 3 a three. If this cow was in my herd, I would pull her for being that skinny, put her in my "sick" pin, and worm her, and give her some additional feed for a week, and then put her back out with the group. If she doesn't look noticably better in a month, it's "off with her head!".