She also has to live with the fact that her entire family is dead. Let's hope Polly is happy!note Probably not. Was Gandalf happy at Saruman's ruin?
Though Lewis reassured readers later that Susan may eventually rejoin them, the book text alone heavily implies that she has Missed the Call, in particular Peter's declaration of her no longer being a friend of Narnia and everyone's reactions (or lack thereof, like Lucy).
Nothing. They believe themselves to still be in the stable (they're not, they're in Aslan's Country like the others), and as long as they continue to believe that they can't do anything to anyone. Even when Aslan provides them a feast, they only see it as rubbish you would expect to find in a barn.