She's very cute and young so she's probably going to change quite a bit.
Butt high, post-legged, pretty upright pasterns, she looks a little over at the knee but I think that's just the markings. Her left hind looks a little swollen, is it just the markings?
I don't think her neck is short, I think she's just at a really odd awkward stage. Her body is broken into to "big areas" head/hind and "small" neck and forequarters. That makes me think that her imbalance is just a temporary "I'm 6 mnths old and look weird" thing.
Overall she's a real cutie. I love her colors and I to love Perchs. What are your plans with her?