I used to make and sell ponies, and she is probably making slightly above minimum wage after the cost of materials for all the hours she puts in to the ponies. The embroidery, even with a machine takes a very long time and is a difficult skill to master to begin with. Her ponies are probably the best quality you will ever find, and considering how much work she puts into all of them, they are pretty decently priced.
For the photo, it would've been nice to see both Derpy's eyes, because in this shot they appear to be normal. For Octavia's mane I wouldn't have used black, more like dark gray. For Derpy's mane I would've used a darker yellow/brass/gold color for the thread holding the parts together to make the outlines more obvious like in the show. Love the plushies you make, they're all so AWESOME ^^