I get that her writing style sounds fanfiction esque but despite exaggerations that may come out of it I think she's telling the truth and here is why.
Ot8 snsd have engaged on a weird revisionism over Jessica never even existing and that snsd already debuted with 8 members. The most telling thing about that was Jaejae snsd special where she did everything to hide Jessica from snsd group pictures, posters and album covers, strategically placing stuff over it to cover Jessica. Golden stars found out and were so furious the video of the special was turned private. Here's a screenshot below
Remember, Jaejae isn't actually an ordinary mc, she's a very close friend to many snsd members. So Jaejae is basically expressing ot8 opinion: that Jessica wasn't even a snsd member. They retconed the history of their own group to erase her, which is worse than anything Jessica wrote on her books. And korean media and knetz are fully on board with ot8s narrative, to them Jessica is the traitor and the attention seeker. Obviously she had to answer back, she's got no support in Korea and was blacklisted and to knetz, sm and ot8 snsd she fully deserved to lose everything due to her "crimes".
