It is a little odd, especially since, as you say, she obsessed on it in high school. I mean, lots of people listen to podcasts, and it can be a way of keeping your mind occupied when you are doing boring/repetitive tasks. But if this is new and unusual for her, it seems meaningful.
Do you have a sense of what her interest is based on? Is she an athlete or someone who was always a big basketball fan? Do you think she has romantic fantasies about the players? Has she had other OCD symptoms in the past? (Germophobia, tapping, counting, checking?) Will she talk to you about basketball?
