Not really. LE have treated it as she was deceased a long time. The fact still remains that no one saw Hailey alive on the Monday also that Clint passed his poly. There is also the fact that things Billie has claimed about the Sunday and Monday morning just doesn't add up and there is no reasonable explanation for that.
Not the FBI apparently, because they had her listed as abducted.
I think it is fairly clear that different LE agencies have been taking different views on the investigation. In the early stages Toombs and CC had jurisdiction, so the public presentation was their view, but now a different county has jurisdiction and the FBI is playing a role in the investigation. IMO the FBI is looking at this case in a different light.