She looks to me to be nice through the shoulder, ideally I would like more slope but she is within a good range. Possibly a little long in the cannon and in a couple of the pics she looks upright in the pastern.
I think she's a little bit light on for bone, I like my horses more substantial - ESPECIALLY if they have warmblood in them.
I actually think her back is a nice length. I like them relatively short. Lovely length of rein and very kind face, looks like she's a nice mover.
She actually looks to me to be a tad bit downhill in build, I would like to see her back a bit more level. I like her hindquarter but her hocks may be a tad straighter than ideal.
In that front on trot pic she looks like she might come a little close with the hind legs, but that can be fixed with correct hoof angles, to a certain degree.
I would prefer a little more arch to the neck but she IS a mare, so she's not going to naturally be as archy/curved as a stallion or a gelding. With correct work she may gain more of an arch to her neck.
What I REALLY like about her is that she looks like she's working nicely from behind without someone in the saddle helping balance her and encourage her to engage her hindquarters. She would be a lovely dressage horse.
I think it ALL depends on whether she enjoys jumping or not. Which I guess you never know until you've tried her. Heart is SO important, my upright-shouldered 15.1hh anglo arab has cleared 1m20 and he likes to take the long spot but that's ALL about his passion for jumping. All the perfect conformation in the world will not make up for a lack of confidence and/or passion.
I really do like her, and I think I'd buy her if I was looking. She is really quite nice. Good luck to you, I hope you find exactly what you're after.