Charli XCX is diverse and experimental enough that my first instinct would be to assume she’s rather intelligent. For example, her collaboration in the PC Music scene comes off rather nerdy and eccentric actually, not exactly pop. And her lyrics usually have more to it than meets the ear, e.g. sometimes intentionally being a commentary on the party persona keeping her distracted from worse things. “I hate the silence (uh oh), that's why the music's always loud”

Of course, that isn’t a shallow opinion so perhaps someone unfamiliar to her would think otherwise

Does she write her own lyrics? Or does someone else write those for her?

I’m not saying she is or isn’t intelligent, and either way she clearly is talented in some area of music, just wondering if she is a singer or singer/songwriter :)