So I might have gotten carried away with this, but I think it can work.
[X] Plan: Isn't It Ironic?
-[X] Offer to remove the evidence of Raith crimes from all of Sarah Green's devices and insure that any backup hard copies she might have hidden elsewhere are also dealt with.
--[X] Do not even attempt to imply that we won't be keeping the information for ourselves. If Sarah's evidence requires further action, we will determine how it shall be handled. Explain this, if necessary.
--[X] In addition to removing the threat of Sarah's evidence, we will also offer to assist her in finding the being responsible for her husband's death. This not only has the benefit of placating Sarah, it may also preserve her status as a useful agent, for us if not the Raith.
--[X] We'll offer Sitha an opportunity to serve by creating and operating a charity. This will allow her to benefit from Mercy In Servitude with minimal input from us.
--[X] If at any point combat starts, activate Melee Excellency and Viridian Legend Exoskeleton (both reflexive, 2 Essence cost)
-[X] STUNT: "So you seek to hide evidence of systematic predation upon mortals by White Court interests. I understand your concerns. For all that feeding your appetites is a less bloody affair than the leeches of the Red Court, the methods and results are often no less distasteful. Case in point," you gesture at the unconscious form of Sarah Greene and the scene which had been set to allay suspicions her death may have raised. "So this is what's going to happen; I'll make certain that none of Sarah's gathered evidence remains in her possession, including any backups she didn't trust to electronic storage. Her threat will have no teeth, so to speak. I'll even go so far as to offer her my assistance in discovering who or what killed her husband. After all, my interest in Detective Greene's murder is what caused our paths to cross today."
--[X] To Sitha explain, "You now have a choice to make that will set the tone for the remainder of your life. When you leave here today, you can choose to serve my interests and be forever free from the Hunger which resides in your soul. Or you can reject my largesse and become yet another predator preying on hapless mortals." Pause as if in deep thought before continuing, "Hmm, I have just the task in mind for you, my dear. I ask that you start a charitable organization, one dedicated to suicide prevention and the wellbeing of those impacted by suicide. You're young and inexperienced, so feel free to involve others as necessary, but you must dedicate at least 24 hours each week to starting and operating the charity, and all major decision making must remain under your purview. Give my offer some thought and contact me within 72 hours with proof of your commitment, or do not and seal your fate." Give Sitha a throwaway email address she can use to reach us.