Her personal life, especially her relationships, directly impacts the 'driver's license' back story. If she had a breakup, the emotions from that would seep into the song.
Olivia Rodrigo's personal life provides the raw material for the 'driver's license' back story. For instance, if she had a relationship where driving was a shared activity, it would make sense for her to use that as a motif in the song. Her feelings of love, loss, and growing up all shape the narrative of the song's back story.