I would have to agree with Ltc4h, you need to spend the money ( I know it is hard right now) and get a good thorough exam done. That way she can heal properly and has a better chance of being sound long term. The longer on waits the more damage that can be done. You also have to consider that these ex-racers have had a enormous amount of stress, strain and concussion put on their legs from an early age, So along with the proper diagnosis and treatment (followed to the T) and supplements wether injectable (which is proven best and cheaper in the long run) or oral, she could potentially make a good horse. But first you need to find out what is really wrong before more damage is done. Because a horse put back to work to soon on the wrong diagnosis can ruin them for life.

Good luck hope this helps and let us know with an update.