No experience with games? Has she watched you play games, did she have favourites from those? Are there certain IPs she likes that would help?

My sister is now a casual gamer. The games that got her into it are Kingdom Hearts just via Disney branding and Uncharted (which she liked watching people play due to the Nathan Drake) which slid her to her favourite series Tomb Raider.

I recommend going that route instead of trying to find some weird fit since if she likes Harry Potter for example one of the best solutions regardless of the time you put in will be Hogwarts Legacy.