How can you read the letter impressions left behind on paper?

You need to make a "rubbing" of the indentations left in the paper behind the paper your wife was writing on. To do this, simply grab another piece of paper (thin) and place it on top of the paper, then with a #2 (or charcoal, if you have one) pencil, rub gently until the pattern of letters/Words appears. This is the same thing people do on tombstones of loved ones.