The primary purpose of a refrain, or a recurring line throughout a poetic work (or prose for that matter), is to draw attention to something important. Used effectively, it can heighten the emotional resonance of your story and make it feel more universal, and LaRocca uses hers to great effect.
“I’ve learned that the most important thing is to keep writing about what I love, what’s important to me, what I’m curious about. I’ve learned to put a piece of myself in every story. And I’ve learned that being vulnerable in my writing means that it will resonate with others.”