I'd venture to say that her hooves might not be optimally trimmed, esp. The front. Difficult to say for sure with those pics, but if her angles are off on her hooves, she would be throwing off her pasterns also.
Yeah, I read that when I looked up information on pastern angle and whatnot. I can't remember if these were taken before or after her hooves were trimmed. I feel like it might have been before. I know I have to have her shod before summer, when she'll be on gravel often. Her previous owner recommended that, as her feet get sore quickly.
Her pasterns are fine. Upright is worse than angled.
This is my '83 quarter horse gelding. Never taken a lame step. His fronts are a little behind him in this pic, but he has a steap angle on all his pasterns. A GOOD farrier and support boots will keep them sound. Our horses are shod like clock work by one of the best farriers in the region... every month.