@Raknasuu
I'm glad you point that out. I'm not fully informed, but I do know kuzushiro has at least 4 ongoing manga publishing monthly (?) right now.
Realistically speaking, that's not possible for one author to be able to churn out chapters regularly and with an organized storyline the way she does working alone.
She definitely has artists that work under her, and I believe they must follow her art style to keep consistency of the manga (either that or kuzushiro draws everything, but only the barebones of her style and the other artists just help her fill in the rest of the busywork/time-consuming stuff).
As far as storylines.... again, I don't actually know how manga industry works, but I think Kuzushiro probably has a consultant/editor, or various editors for each manga she works on, and that person helps kuzushiro develop the storylines and gives feedback to ensure kuzushiro is staying focused/on-theme for whatever genre the manga is about. So I think Kuzushiro definitely has involvement with every single one of her mangas (otherwise it would not be honest to label the manga as a "kuzushiro" work if the manga isn't even worked on by author/artist Kuzushiro).
It's also possible kuzushiro might go for a monthly rotation system such that each month, a particular one of her manga gets the most of her attention, before she moves on to the next one in the next month. In the months in between the manga she's not focusing on for those months, I imagine the consultants/assistant artists mainly reach out to kuzushiro to get her "OK" on where they believe the storyline should go.
Doing things this way would create a more orderly system that prevents the manga from suffering from bad writing/bad storyline development/bad art despite their monthly publishing....
BUT AGAIN, THIS IS ALL LITERALLY MY OWN SPECULATION. The one thing I know for sure though is that Kuzushiro has an editor that helps them with solidifying on the storylines for all the manga she works on..... otherwise they couldn't be this good with the aggressive publishing timelines she has for all her manga, so she has to have some kind of writer/consultant/editor helping out.