Well she’s been in training for about a year with someone else and would be in full training with the trainers at my barn. I have some experience with younger horses but not owning. This would be the first horse I’ve owned.
That depends. Are you an experienced rider? Have you rode and schooled young horses before? Are you will to commit to a let down period if necessary? Do you know the differences between how on track tbs are trained, compared to regular riding? Have you the time and patience to work with something that's potentially highly sprung? Do you know about feed changes, and can you cope with potential ulcers and other medical problems? If yes, then there's a good chance you're not crazy.
However, if you have just learned to canter or maybe popping over a small jump, if you've only really just learned the difference between a pommel and a cantle, or basically, if you're a beginner or a novice rider and/or horse owner; it's crazy to consider any young horse, nevermind an OTTB.