I wouldn't breed anything until at least 4, but that's just me. I guess I want to give my kids a chance to grow up before having that stress. There's alot of issues that can arrise with their maiden foal, and at such a young age, it never helps anything. But if you think she's healthy enough, at least have a vet check her before you breed her.
Oh, and welcome to Runninghorses.net!
