I forgot whether or not the ghost snitch, but they'll know that she was the one who poisoned the duke. Real Rania is already dead (the ghost following fake rania around). After the fake is dead (?) I m sorry I forgot, the ghost of real rania will talk to camilla. She actually likes camilla and hoped they could be family, but she died 3months before the "real camilla" Returned to the body.
I think this is also the beginning they are aware of swapping soul cult
So they are in situationship, ML doesn't want it to have a label but still want to be exclusive. Smh.