Sounds like you made a good choice. The abscess would concern me the most, especially if there is a chance it has invaded the joint. She probably could make a nice pet but if you are going to invest time and money into training a horse I would go for one that has decent conformation to begin with! (Granted, my family owns an ugly horse that is cow hocked but was trained on a ranch, and he is sound. Sound horses can have conformation faults but some not all conformation faults are created equal)