Nah she paying people to work with her to make this game
Renpy Stuff. Everything is free, Animations made with Koikatsu and Assets are c&p. You can find the same Rooms/Backgrounds etc in many other games. I've never worked on a VN and tryed it (with chatgpt for quesions) and did a whole scene with 3 koikatsu animations and a read time of 20min in under 3h work. And most of the time was youtube/google for koikatsu guides.
He/She gets 5k ea months. no mercy for a typical VN lazy dev.