Nico looks to be a good example of what I picture when I think of good QH bodies. His angles are good, he is well muscled and from the pictures, he appears to have good bone in his leg and big feet. All good things.
Is she looking for a halter horse or is she wanting something that she can ride? If she is wanting to ride, you might point out the shoulder, pasterns, and feet on him and mention that he would likely not stay sound for riding because of them.