I still disagree. Her hair is the same length between both shots. Maybe her hair is disheveled in an ever so slighty different manner between the shots, but the length is more or less the same.
As far as the background is concerned, we're comparing a wide shot to a close-up. The close-up could easily be framing out certain things that are visible in the wide, especially if the angle of the camera is even slightly different between the shots. Or, maybe the close-up was taken after she walked a few more feet into the room, which would change what we see behind her. Nonetheless, there are similarities in both shots. The wall looks the same. Both shots have water coming down from above.
She's wearing the same shirt in both shots, which should not be brushed aside so easily. It's very telling.
I don't see any significant difference in the broadness of the shoulders. Seems like confirmation bias on your part. Again, we're comparing a close-up to a wide - it's not an accurate method of comparison if you're trying to determine a difference in size between two objects. I also don't think that you can make a reasonable comparison between her facial structure in both shots, given that her face is almost entirely in shadow in the first shot.
If it turns out that you're correct, I'll be the first one here to sing your praises. But, I really don't think that you have enough information right now to be making these definitive statements that it's so obviously a flash forward, because it's not remotely obvious that it's a flash forward. It's nothing more than your personal theory based on very little. My opinion is that the shot exists simply to reveal that she has a disfigured face.