That's kind of sudden. I read her itw now. Maybe she's having a massive letdown after winning the big one. I won't be surprised if she comes back next year or sth, when she feels fresh and motivated again. But if she doesn't, best of luck to her either way.
I'm not too worry about Gilles retiring any time soon though. I don't know, but I don't think he's at that point yet even though he does have a lot of chronic injuries.