Yes, these are supposed be skinny dogs, and for greys to be overweight can be even more unhealthy than for other dogs, but I don't consider their racing weight to be desirable either.
It is hard to tell from the pics, to be honest, because of her coat or the light, but I think your girl looks good. Personally, though, because of their build, the stress on their joints and the fact that these dogs have been bred with such small feet, I like to keep my hounds as lean as possible. Merlin and Sagan recently went to the vet and they have both put on a couple of pounds - they often do in the winter, because our winters are icy and long, so they don't get to run as often as they do in the summer. They have always lost the weight again by late spring, so I don't worry too much anymore. I don't cut their food by much, I just cut treats and lengthen their walks.
So, if I were you, maybe I'd cut down on cookies and see if her hips start showing a little more than they appear to be showing in the pictures above. You should be able to see the last 2-3 ribs and a hint of their hips, but every dog is different. For example, Merlin doesn't have that "tuck" under his tummy anymore, even when he's at his optimum weight of 75 lbs, and yet I can always see all of his ribs, even when he's overweight. Sagan, on the other hand, has the "tuck" even when he is a couple of pounds heavier than he should be, and I can still see the last three ribs, but his hips are not showing anymore. So I think that developing an eye for one's dog's optimum weight is key.
I really wouldn't stress over it though. I used to obsess all the time about whether Merlin and Sagan were the right weight or not and it's silly. One day they looked too skinny, the next I was sure they were overweight Now I have learned to relax a bit more about it. As long as they are not more than 2lbs overweight or underweight, I don't worry too much. They are lucky in that they can lose weight pretty fast with just a little bit more exercise and fewer cookies.