Join Date: Aug 2009
Location: New South Wales, Australia
No one can make the decision for you.
Although carefully consider the situation. You have a horse that, besides their potential ability, you are quite happy with it seems. If you get a new horse, there is no guarantee that they will be better at your chosen sport than your current one, and there is no guarantee that you and the horse will be a good match, which is often something you can't trial prior to purchase
You mention her build and her injury, but have you actually had any problems with her yet? Have you hit the point where you cannot go any further with this mare, or are you just considering the future?
A third point, which is worth considering I think but is of course not really my business and related to your life, is that at 15 years old your life is likely to change dramatically over the next few years. All kids say they won't grow out of horses, but for a lot of people priorities shift, whether it be for school work (which gets harder) or friends or boyfriends. I got a young horse when I was 13 and by the time I was 15-16 it was ready it was for full work, but I wasn't. I had my school certificate, a boyfriend, teenage dramas etc, and then I left home and had to sell my horse. Through all this, I would have to loved to have kept my old horse who I didn't like as much, but that I could just jump on and ride and do whatever with in my spare. I already knew him but I couldn't do that with a new horse, a young one.
Also, as you get to higher levels, a new horse that will be competitive is likely to be expensive but I guess you have already thought about that.
If I were, I would really think about it. If you like this mare besides everything else take her as far as you can go, she may not be affected by the injury. See if you are going to have the time and money to actually excel in your chosen discipline, and keep your options open for the future.