Lyric discussion by Dacino 

I belive you really have to focus on "And she fights for her life" as well as "Nobody knows" Possibly she is dying of cancer or another illness and as she goes about her daily activites and is always reminded she is fighting for her life "as she goes......."

"The sun has been down for days", she has known about the illness and it has kept her down for days. "The sound of water makes her dream, awoken by a cloud of steam, She pours a daydream in a cup, a spoon of sugar sweetens up" Her time is shortening so she enjoys the simple things

I don't think you have to be dying to start enjoy the simple things in life. My opinion is that she's not very happy with the way her life is, maybe a little depressed and down, but she is still fighting to go on. She tries to make the best of it and hope for the best ("Perhaps a letter with a dove/Perhaps a stranger she could love"). Fighting for ones life doesn't necessary mean a fight to survive, but to fight to have the life you want to have and to be happy.

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