And she sent these pictures.....
so I say...
TURN THE TV OFF!!!!!
OK, I guess it's time to stop torturing you and try to answer your question.....
It's actually a fairly easy solution.
The hard part is going to be matching the stain of the mantle.
You could paint the mantle to match the woodwork I'm going to suggest you do, but I don't know if you are married to the natural oak.
If you are, the following needs to be the same type of wood as the mantel.
If you paint the mantel, you can use clear pine or poplar.
Take a 1x6
and three 1x4s
and make a frame to go on the wall over the fireplace.
The 1x6 should be the board for the bottom of the frame and it should rest directly on the mantel.
The 2 vertical 1x4s should line up with the outside edge of the mantel shelf.
The top 1x4 should butt up against the ceiling and you need to cut the crown molding to jut out and go over the top board.
So you will need to get some more crown molding.
The top board should look like the same dimension as the two side boards, so it should probably be wider to compensate for the overlap of the crown molding.
If you want a more finished look, apply a 1/2" quarter round, or a scotia molding to the inside of the framed panel.
But you will have to use the same wood as the mantel if you're going for a stained wood look.....
Install the fabric inside the wooden frame.....