She had come up on the roof terrace of Lafayette obviously because she needed a quiet place to read the letter and while reading she started to cry. It had been a scene of extreme lonelyness, I simply HAD to press the button, but when she left in a very low mood I felt a heartbreaking sympathy.
I am so happy this came up via 'random' because it's a great photo and a reminder of one of the best views in the world (just above some of the best frites)