Are you sure you clicked the Move To button and not the Labels button? When
I do this, I see "Inbox" under Move To but not under Labels, and it is
listed separately from all the user-created labels.
Any chance you clicked on Move To when you were looking at a listing of
messages and none was selected? It doesn't appear unless one is selected or
open.
Possible workaround: When you have the message open, there should be "Trash
| X" near the top (below the row with the Move To button). Click on the "X"
to remove that system label from the message. Now you should be able to
find the message in All Mail, and can click the Move to Inbox button from
there.
Or try running the "older" version of Gmail (which has a different
arrangement of buttons).
I don't have a good answer to your question, except to note that "Inbox" is
a special reserved label, and I think I've read that there's one or two
subtle differences depending on how long ago you opened your Gmail account.
Or maybe her computer has bad code in the cache, so she might try deleting
the cache and cookies to see if it makes a difference.
Andy
I don't have a "Move to Inbox" button anymore, ever since the changes a
couple weeks ago.
Though I still have it if I drop back to the "old" version....
Andy