I'm so sorry. I had to put my Cockatiel, Pretty Boy, to sleep this morning, so I feel your pain. Still, don't give up. Before I had Pretty Boy the previous owners said she got out for days and then came back. I don't want to give you false hope, but it's possible. My other Cockatiel, Danny, I got because a friend found him in the yard, so maybe someone took Nelly in and she is ok.