I have this theory only because of how often Melissa brings up the Author of the novel in the story and how the author wrote the characters.
I honestly believe that the Author of "The Brats I Love" was reincarnated or transmigrated into her own book as Yuri. She was probably super excited to meet her characters and live the life of Yuri because she made those characters and so they must be to her taste. So when she first met her characters, she didn't expect them to be such assholes. It probably made her feel like her story was a failure due to the fact that her characters were as fake as a paper tiger. But she already dived into it and she knew the consequences of ignoring them because they already fell in love with her appearance. So when Mellissa came along, she was probably relieved that there was one sane person even if it was her antagonist.
now, I know that lots of people believe that Yuri had been given a second chance in life, but that wouldn't make sense because wouldn't she avoid them if she already knew the hellhole that the reverse Harem was?