I totally understand what you want to do for your horse you care for very much, but please understand from the viewpoint of a serious leasee, that it looks like all you are doing is to get free training for your horse (which, indeed, you are). We recently had a VERY similar ad posted here on CL (I actually thought it was you, but it's a different horse) and the poster has been really blasted about it by people saying the same thing and ridiculing the poster for trying to get free training.
I really doubt you will find what you are looking for. Is there any way you can barter something for a trainer to take her and work with her? I traded two mules to a top mule trainer to train my third mule, because it would have been hard for me to pay him. I asked him if he would be willing to work that deal and he agreed! Can you do anything that would be of benefit to a trainer (accounting, website design, babysitting, etc.) that you could barter? It may take them more time, where they work your horse in around paying customers, but that looks like it would be to your advantage right now.
Good luck! I hope you find a situation that works for you and her both.