Dressed as the Villain's Sister

Xia Zitong read a novel. She loved and hated the big devil in it, and she felt pity for the male protagonist in it. She thought, how wonderful it would be if she could travel through time and change this tragic ending. She thought about it, so after traveling through the book, what impact would her intervention have on them? As a result, not only did she fail to successfully match up the male protagonist and the villain, but she also got herself involved, which made her want to cry. Why didn't she follow the plot of the novel?