My early teen cousin is learning to play keyboard/piano. She likes to compose her own songs, and she’s good at that, but perhaps could use some help with the basis rhythm.

I thought that a book of rhythms might help. Something like this, but it’s going to be the wrong era for her on the surface, although the rhythms repeat through the ages. Encyclopedia of Piano Rhythm Patterns: Popular Piano Rhythms and How to Play Them https://amzn.eu/d/2JdTsST

Please point me in the right direction. Thank-you in advance