I don't know anything about Harry Potter, but she does and I know the smiles are going to shine when she sees this! I hope (and will suggest!) that she use the journaling cards and write about which her favorite Harry Potter book/movie (I know there have been several!) was or if she had any imaginary thoughts about her doing anything in the stories that she thought was cool...maybe she imagined herself a wizard and could do what he does! I will encourage her to write about it, so in years down the road...she will have those memories to bring her happy thoughts!
You can do this same thing with any theme...if you just see a pretty picture in a magazine or a place you'd like to go or even something cute, funny or something you'd like to have...I saw one that I wish I'd kept...it was the prettiest watch I have ever seen! Granted it was couple thousand dollars..and I wouldn't NEVER spend that much on a watch even if I had it, but...the watch was pretty and I wish I'd thought to keep the page!
Check your magazines! They are full of things you might like to include in your junk journal!