
With just a quick search, you'll find quite a few posts about therapy chickens. Here are a couple of examples...
therapy-chickens-3-flocks-changing-the-world.1187268
This article addresses children with disabilities but maybe there could be something that would be of help to you:
kids-with-disabilities-can-enjoy-chickens-too.68187
Best wishes to you and if you have questions about anything, just post...everyone is here to help each other.