Nikki Flores started writing songs at age eight—her parents even built her a home studio so she could follow her passion. As an adult, she’s become an in-demand writer for pop and R&B artists, providing conversational lyrics and insistent melodies for the likes of Hayley Kiyoko, for whom she co-penned the smash “Sleepover,” and JoJo, whose post-teenpop efforts such as “Mad Love.” were given extra gloss by Flores’ songwriting savvy.