Now it is fine that thanks to the screen at the end of the chapter there are no doubts: but otherwise would you not consider Mallory the number one suspect to be the "nemesis" of the game?
dark past, signs of mental imbalance, possible reasons of bitterness towards the parents of the protagonists, on Mc's trail for a long time, often protagonist of attitudes that could alienate Jaye and MC, clearly not sincere about her motivations...
and yet she easily gains more and more trust (strangely also from Jaye) and more and more permissions and freedom