When a photo is posted remember.. you are taking a 3 dimensional object (in this case a horse) and putting it on a 2 dimensional surface. Shadows and what have you can change how things look. The angle of the photo can too. The photo of her saddled really shows the lack of proper development of her neck.
She is a pretty nice horse too. She can be helped a lot. Here is something else to take note of. See her belly? It sags and even bulges a bit where the flank strap is. Part of that may be extra weight but I don't think so. That bulge shows she has under developed abdominal muscles.
In order for her to raise her back and lengthen it, she must be able to contract the muscles along her belly and lower her head. She has not done that in a long time.
IF she is trotted up hill.. and this is with you standing in the stirrups with little contact on the reins other than to remind her to stay in the trot.. she will lower her head, lean into the effort of going up the hill and contract her abdominal muscles. It is simple physics.
I had a horse much like this one as my first horse (when I was the ripe old age of 13). By the time I had that horse a year (and had considerable hands on help from wiser people) he looked vastly different. His neck had turned over a lot (muscles on the top were getting larger than the ones on the bottom) and his belly was gone.
I did ride almost every day (at least 5 days a week) and did a LOT of long hills with him on a loose rein trotting. I also did other things.. and I rode English (not that the style of riding should matter.. the goal is the same).
A year later someone asked me if he was the same horse.. Yeah.. it made that much of a difference. :)
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer