It's like being knocked kneed in a human. The horse's hocks are sort of facing in towards each other instead of facing straight back. It' isn't a desirable feature and it's a conformation fault. It is also quite common. It is typically a genetic thing and there is nothing anyone can do about it.
That being said, your horse may grow out of it somewhat because at 8 months old there are a lot of changes yet to happen. Even if she doesn't she can still be an excellent trail horse for her whole life. She just may not be a good halter horse.
Thank you for the reply. Her lower legs are actually turned slightly outwards, not sure if that changes your opinion. Mom is a very large halter horse and so baby's bones are very large for her size. I am hoping that maybe she is in somewhat of a odd growth point and maybe they will even out slightly as she gets older.