She looks great for an old girl and structurally quite good. A nice using horse I think. Can't tell much specifically from the photos, but she looks to me the type to stay sound for a long while yet.
Edit; although you may want to get that saddle fitted, it's lifted at the back in that photo indicating it's either too curved in the tree for her, or the wrong gullet size. Personally I'm leaning towards tree shape but only because it looks like it's sitting nicely balanced on her back.