According to a post on the official Iris Dement website at irisdement.com:
It has come to our attention that someone has created a Facebook account under Iris DeMent’s name and is trying to friend her fans, and then proceed to try to get money from the fan. Please be aware that this is not Iris DeMent and that she does not have a personal Facebook account! Her Facebook page can be found here.
You can read the post at: http://irisdement.com/2016/07/iris-dement-scam-on-facebook/