Saubi1234
I feel like this is an among us game where she is litteraly telling you she is the imposter and murdered everyone but no one believes her because they think she's joking. She's detailing exactly how she's going to betray him and is manipulating him as he goes along with it under the assumption she's just joking. Honestly would be pretty funny to have that gotcha moment where she says she actually was betraying him the entire time.
You people are thinking to much, If Mr. Author dared to make her betray him them many people will delete this novel from thier list and I am one of them. So this just a high risk for nothing. No one love betrayal of one of those who should be loyal to the MC unless it's used in the prologue as foundation. So this is just a suicide move, even killing a character who get many attention and liking from the readers and the MC is a very dangerous move let alone making the character betray the MC.