First of all, without seeing the failed mail message, I cannot guess at why it was returned.  I do know (as a former computer programmer) that there are *many* reasons why mail can fail that have nothing to do with the account being closed.  Even when the return message says "permanent error" it isn't really a permanent error.

As for the lack of response to a call: Adonia is usually very, very, very, busy.  Last time I saw her, she had 3 phones and they were constantly ringing or receiving texts.  So, the lack of a response doesn't mean anything, either.  If you are a client that she knows, and recognizes the number, she usually calls back if she can't answer right away.

Hopefully, Adonia will see this and post that everything is ok.  But, until I hear otherwise, I would say keep trying to call her.  And try calling at non-peak hours, although given this hobby and how busy she is, I'm not sure what those hours might be  Maybe early afternoon west coast time?