Please give Didi a hug for me when she is more herself, or at least accepting of affection. Then give yourself one as well.
I hope Didi isn't contagious! Moving her seems to be something that would be horrible for her mind, and the ulcer situation, not to mention the contagion aspect.
I almost am afraid to ask, but if she is contagious, will this scrap the possibility of a future as a broodmare?