I'd simply suggest a) a song that's actually performed with a guitar, b) a song she knows the lyrics by heart [otherwise that's an extra chore] and that she c) search for it on Chordie. No offense against rap or hip hop, but those are drum/rhythm centric genres that don't generally lend themselves to prominent chord progressions (at best, chords are 'implied' while basslines and melodies are more common).
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