Silent Harmony by Michele Scott
Totally not what I expected when reading "she is also an equine empath, someone who has the ability to read horses minds and moods" Yeah I wasn't a fan at first but I do love a good horsey book and it was great. Admittedly parts were a little iffy, a few moments of bets and boys but that's typical of the YA genre.
It's no Heartland or A Circuit but for it's story it works. There isn't as much horse info as Heartland or the actual feel of competition in A Circuit which is quite unfortunate but I am hoping the sequel will pick this up.