[X] She knows where witches come from and that the soul gem is the soul, yes?
[X] Explain your belief that you are a product of a wish. Omit any suspicion of whose wish in particular -- multiple timelines, Madokami, and Madoka's potential should all remain tightly suppressed.
-[X] Give evidence: no history, sudden appearance, strange knowledge. Omit any mention of personal knowledge (Mami, Homura, etc) but note both general knowledge & specifics of Puella Magi system.
[X] After whatever immediate questions she has...
-[X] Drop a summary of current problems on her.
--[X] Kyubey is eventually going to try to get us killed.
--[X] There's at least one malignant weirdness around, you don't know much about it except that it's tried to kill at least one person and is screwing with some magics. (Feathers)
--[X] One of our allies is rejecting her wish and her soul is all kinds of fucked up.
--[X] Walpurgisnacht arrives Apr. 30, because why not. Arguably the least of our problems, it's "just" a witch.
[X] You don't know a ton about her, but as long as she's not interested in mass murder you're more than happy to offer her almost whatever she wants in exchange for contribution.
-[X] You have a system to break, after all.
[X] I think I'm the result of a Wish. Specifically, some girl wished for something like me, and that just kind of...spontaneously created me. I woke up in an alleyway vomiting blood, no memory of myself other than the name Sabrina, and full knowledge of the Magical Girl system. Then I wished to control Grief. So, in a way, it was like two wishes in one, specifically for this power.
-[X] I'm not sure if I was originally human, or if I was a Witch turned into a human through a Wish, or whatever. There are no records of my existence before I woke up in that alleyway, and, as you can imagine, a foreigner with white hair, violet eyes, above-average height, no ID or belongings, total amnesia, and no one even trying to look for her doesn't seem to be a natural occurrence in Japan.
-[X] What can you tell me about my soul? I only know that power copiers can't copy my power.