Apparently she was talking to Akechi in the trailer and talking about the Phantom Thieves and how she doesn't support them and wants to investigate. So shes either a new confidant like Marie or theres a new dungeon where she becomes a new party member which seems unlikely. Another thing could be a whole other side story based on her with Akechi during the events on P5. If thats the case I wonder if she helped him get through the palaces like Kaneshiro's when he mentions seeing someone with a black mask. Either way we got to wait until next month for more details
(edited by Bonafied-Monafied)