I'm glad to be reading some of these too! Have you read the Jilly Cooper books? I know they're more society scandal types set in the horse world, but on the plus side, they're long and there are 3 of them (Riders, Polo and the latest, Jump). The Perfect Distance is a YA book but I read it as and adult and found it interesting, especially if you're into Hunter/jumpers. And my own book, though considered to be for late teens (14+), is getting quite a few reviews from adult women. It's called Blaze of Glory; I'm including the Amazon link below in case you're interested.
Whatever you think you can do or believe you can do, begin it. Action has magic, grace, and power in it. – Goethe