I'm going to avoid the soundness issues for the moment and address the rest of your question.
What kind of levels are you refering to? Dressage? Eventing? Jumpers? Or another sporting discipline?
Your horse appears to be very green over fences; and not started over fences under saddle, and doesn't appear to have a dressage foundation? Is that correct? And your horse is 9? And hasn't been able to stay in steady work because of a variety of different soundness issues?
It the above summary is correct, that neither conformation or soundness are limiting you horse. Training is.
To start out at the lowest level in any of the disciplines I mentioned, she will need at least 1 year of solid, consistent, focused, quality work. That's to do a Intro or Training dressage test, a Pre-Novice event, or 2"6" schooling jumpers.
After that, it's a question of how much training you can get on the horse before age and soundness impose limitations. So unless you're circumstances change dramatically, I think the a level above those mentioned in the last paragraph is where you're going to top out.
Doesn't mean that she isn't a wonderful horse; or that you won't get years of enjoyment out of her or that you won't be successful competing at lower levels. But at 9 years old, not finished in a discipline, plus soundness problems, you need to be realistic about how far she can go.