The conditioning for racehorses takes time, much more than you have, and much of it would consist, at the trainers, of breezing her on the track, both by herself and against other horses.
They have to have horses to "race" against, or else when they are really on the track to run, they will be wanting to play, and not listening to the jockey.
And the horse has to be taught how to rate itself, to hold back when asked, to open up when told to, and not fight the hands.
It is not something easily done, if at all, in the backyard, unless you want to bushtrack, that is what they call it down South, where people are just ruining, and that is NOT a play on words, as they run horses hard, and don't care what happens to them, against a bunch of good old boys.
Dubious training, dubious feeding, dubious people in many cases.
Many horses are nominated for all sorts of things when foaled or shortly thereafter, it doesn't mean the horse is particularly outstanding, it is just those things have to be done in timely manner, as if they aren't, then it doesn't matter how good horse is, they are out of luck.
I'd just find something to enjoy with this horse, as the opinions on her leg injury given by above posters is sound.
Racing and training is very expensive, if it is done right, and if it isn't done right? Not worth doing at all.
Horses make me a better person.