If you want to catch up with Holly's writing, here's a taster:
https://www.rockpapershotgun.com/2019/03/11/players-react-to-video-games-in-unexpected-ways-and-scary-edutainment-games-prove-it/
https://www.newstatesman.com/culture/games/2019/08/moral-panic-over-fortnite-and-purpose-play
The book she referenced was indeed called Historia Ludens and is published by Routledge.
She's @nielsen_holly on Twitter.