I just found this interview with Lucie from back in February. She has a lot to say about this film.
Interestingly, the reason Cate Blanchett dropped out was because Sorkin decided to direct, not just write.
https://thepalmspringspost.com/balancing-act-lucie-arnaz-opens-up-about-her-music-memories-and-focus-on-family-after-delighting-audiences-at-michael-holmes-purple-room/