Truthfully, I don't see anything wrong with her legs, she just appears to have quite a bit of angle in her pasterns. I've seen that in a lot of Arabs and it never caused a problem for them.
Lindsey, the pony vs horse thing is something that is usually up for debate LOL. Depending on where you are from, what discipline you ride, what types of people you learn from, etc will dictate how you view that particular subject.
Many people view any equine under the height of ?14.2? a "pony", regardless of what breed it might be.
Then there are others like me, and apparently dbarabians, that go by breed and call a pony a pony because that's their breed, regardless of height. Same thing for horses. I used to have a registered QH that barely broke 13 hands but she was never, ever a "pony", she was always a horse because she was a horse breed.