It clears itself up in episode 4 (I think) but basically in season 2 Marinella goes to the police to get away from Scianel's son. Assume she gives them information to arrest her as she is in prison. The money is to buy Marinella off so that she doesn't testify.
Patrizia and Marinella were/are friends so that is why she has been told to fine her.
Oh and Marinella is still fit