Trap her

You go back to her **** room. It seems she hasn't discovered anything so far... You go to one of the side rooms and wait for her return... It takes her some time, but she indeed, returns. When she walks into the middle room you get out of your room to trap her inside by locking the door behind her.

Sofia (upon entering the room): Welcome back! I wonder if you managed to extinguish the... WHAT?! Where is she?!

She runs into the room to take a closer look and you use this time to shut the door behind her and lock it. She has the key on her, so you leave yours in the lock to trap her for good.

Sofia: What are you doing?! Who is it!? Let me go, now!

Lily: I am afraid that is not going to happen mother!

Sofia: Lily! How dare you do this to me! Let me go immediately! This is the will of the lord, do not dare to defy it!

Lily: I think the will of the lord will be coming for you soon enough! Enjoy your time in that room while you still can!

Sofia: WHAT?! Do not dare to leave me here! Open the door or you will regret this moment of your life forever!

You walk back upstairs without giving a damn about her curses and threats. She is going to remain inside there until tomorrow!

In the morning, the inquisition arrives. You lead them to Sofia, open the door for them, so they can take her away. You see Sofia bond and tossed into a cage on a cart, she is cursing all the men who put her into that, but nobody is taking her seriously any more. Soon, she will be interrogated and trialled for what she has done. A man with a red cross on his chest steps to you.

Robert: My name is Robert. We have been trying to find a way to bring this witch, Sofia to trial, but we had a very hard work with her... She had been blackmailing our holy father, the pope, so no direct action could be taken... When our dear friend, Constantinus told us of the situation here and that you had the necessary evidence, we knew, it was time to act and finally catch her red handed! Or at the moment, red crotched, to be more specific... Thank you for your help {if Social hierarchy < 80}Baroness{endif}{if Social hierarchy = 80} Duchess{endif} Lily!

Lily: At first I too was deceived by her... But as time passed, I realised her true nature and had to find a way to put an end to her schemes! Glad you finally have her arrested! Finally, life can return to normal here!