Not the best shoulder angle in the world, but not terrible. Her scapula has some room to move back for a jump, but the tighter angle (indicated by yellow dot) shows she probably doesn't have quiet a free movement. Pink line indicates that her wither is just about level with her hind end, no nasty downhill build there, you still need more work to raise the back so it isn't such a V-like dip.
There's something about her hind end that bothers me, can't really put my finger on it :P
I think it's that she could be cow hocked or toed out in the back.
That's just what I see at a glance. Cavalletti are great for topline building. Raise trotting poles and always incorporate them into the routine. I like to keep a set of four shorter stride trotting poles on one side of the arena and one set of three larger stride trotting poles on the other. If you have a lake or river nearby, ride or lead her through it, this would help loosen tight muscles.