I agree with everyone here.
How about instead of forking out all that money involved in breeding and proper mare care etc., you go down to the auction and get yourself a nice weanling. Or any number of other young horses who are prime for training in any way you wish and desperately need a good home. Heck just hop on craigslist and I'm sure you'd find a bunch for under 200$, ripe for the picking.
I personally am against this breeding. This mare is a rescue for crying out loud...you know nothing about her, and she apparently has a horrible disposition to boot. That alone would automatically disqualify her from breeding in my book. Do you have any more pictures of her?
And just why exactly do you want to breed her so bad? What is soooo special about this mare that makes you and your grandfather think she deserves to be bred?
Perhaps I am jaded from my early years helping out at a horse rescue...or is it from the many trips I have made to local auctions just to watch as yet another product of indiscriminate backyard breeding was shuttled through the chute?? One right after another after another. In this economy, and with our current HUGE surplus of horses, I would not breed anything that did not possess great bloodlines and showability. Why do we need yet another unregistered nondescript baby running around? You can not guarantee you will not sell her. This whole thing seems just a little bit irresponsible to me.