I am speculating here, but maybe it’s wrong to assume that Naoko owns all legal rights of “Sailor Moon.” She owns the broadcasting rights of the 90’s anime and her own manga, and she may be the major shareholder, but TOEI, Kodansha, and Bandai may have their share, too. “Sailor Moon” was ultimately animated by TOEI to sell Bandai toys.
On a different note, I have never seen Doremi or even Precure, but I wonder if these shows have episodes as heavy as those of “Sailor Moon.” The 90’s anime was a kids show, it had silly episodes, but episode 45 (first season) sent Japanese kids to the hospital. I am not sure if modern TOEI is as “daring“ as 90’s TOEI.
Some episodes of the original “Saint Seiya” are pretty brutal, too.