Weaker almost 'ewed' neck, ties in low, with weight this would improve some, but she'd be in a round pen in a 'rig' at my house.
Over badly at the knee in the one standing shot, not so bad in the other, would make me a little leery of heavy driving, but that may just be an angle thing.
Her hip as stated before is kinda weak, but overall, despite all that, I like her.
Her plain head is not that bad, I have seen some Horrible heads win Alot, but they had killer necks and top trainers.
Her color is perfect, and makes her a more appealing animal all over, and she seems willing in the pic's to show despite her thin condition... (And Kudos to you for knowing she's thin, I've run into a whole rash of ppl lately who have thin animals and call them Refined!
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I'd say she'll do well filled out in lower level halter shows and driving!