Are there any organizations that I can sign a sick horse over to. I cannot afford the treatment she needs.?

I have a 10 month old filly that has been diagnosed with either EPM or wobblers. The only way that they can tell for sure is to have her get a myleogram. Unfortunately, I cannot afford this treatment for her. If she doesn't get a myleogram to pinpoint what is wrong with her then she will have to be put down. I simply cannot handle that and would like for her to have a chance at living if she can be treated. I haven't stopped crying since we got her bloodwork back and the thought of having to euthanize her just tears me up. I am in Fort Worth, Texas if anyone has any suggestions I would appreciate it.