oh, hello there!

Now that her father is free and her family is reunited, most of her problems seem to be solved. Key word: 'most'. When problems disappear, new ones take their place.
She'll start a new year at Hogwarts, with new mysteries, new dangers, new problems.
And someone who everyone thought to be gone, to be finally gone, rewins his power and comes back, ready to continue the crusade that he started long ago.
There will be war; there's no turning back on that. But there are a couple of school years before the real worry needs to be felt.
In short, life will get pretty serious.