Found AGSG Pigeon in Michigan

[Boohberry]

About mid July a pigeon showed up at my 90 year old Grandma's lakefront home. Being a bird lover she has followed all the information I have found on the internet and has been feeding and caring for it. It has taken up residence under the upper deck of her house. From what I see on the internet the idiot that bred this bird and sold them has directed the buyers to release them. What in the heck do with do with this poor thing? We have called the humane society, DNR and no one handles pigeons.

Any help would be apprectiated. Grandma enjoys the company but knows that come cold weather if most likely will not survive. She would love to find it a home.