My friend is super obcessive, is that a problem.?

She is obcessed with twilight, like hard core... but before she would get obcessed over other celebrities... and wouldnt stop talking about them, and when we hang out she brings the book, and tells me all about it... one time i played guitar hero at her house and she left me played it with her little brother... then like she went on the computer and was hypnotized into it... could she have a problem?