Okay, so the description says that she wants to change the story so she doesn't die, but that every time she "tries to make the story follow its original path, the more it diverts." Is she trying to change the story or not?
This also says she's the "supporting villainess," so maybe there's a primary villainess that her brother falls for instead? Tbh I'd find that more interesting than a generic Villainess Reincarnation story. Someone trying to change fate, but instead of succeeding or doing nothing, it's changed into something completely different and not at all what they wanted. But I'm assuming too much from just a description and a prologue