this super fandom of hers, it might just be one aspect of an immature personality overall. And that's the real issue. But if your girlfriend is well adjusted for her age and she's super on top of her life and all that, then this T Swift, Harry Styles obsession might just be like...
“One of the drawbacks about adventures is that when you come to the most beautiful places you are often too anxious and hurried to appreciate them.” -C.S. Lewis, The Horse and His Boy