@Reeses
I thought many times about responding to this thread, but second guessed myself. But here goes.
My barn is full of a number of women that purchased green OTTBs, with stars in their eyes, thinking they would make it work. My barn is now full of these women that are afraid of their horses and barely (if at all) ride. At some point, confidence and trust, once shaken, is really, really hard to regain.
A green horse, for someone on the low end of experience and confidence, is a terrible idea. You (the primary rider and owner) need the skill, confidence and timing to work through situations in which the horse has limited skill or confidence, whatever that might be. You don’t know ahead of time when those situations might arise, or what they might be.
A horse that is already trained and has life experience in a number of situations is a gift. One that allows you to work on yourself, and learn in a safer environment, one in which the horse already understands its job and had the self-confidence needed to allow you to learn.
Also, please understand that a young horse will go through changes and periods of its life that, for whatever reason, it might not be as quiet and easy. My young gelding was an absolute SAINT at 3 and 4 years old. At 5, we have had a number of challenges and set backs. Don’t think there aren’t times (a lot of them) where I wish I had bought a mature, experienced horse. I’d be out showing and having fun, instead of at home, working on training problems and developing my young green horse.
OP, don’t do it. There are many better choices out there. Don’t get emotionally attached to this mare and sign up to go down a road that you never intended to go down.