Bella is hanging out in a Jarvis - the familiar one - handwriting a nonaggression proposal-slash-bribe. Has to be handwritten. Damn fussy demons. At least it's okay for her to conjure rather than personally harvesting the weird ink she's supposed to use.
[I do not have any plans to do anything horrible to you. And I am very, very magical.]
[I just need to know what it is she's up to, so I can see about handling her myself. Why do you turn into her?]
[Why not?] Bella asks. [What can she do? Besides kill or hospitalize a few hundred people. Which needs to stop.]
[How attached are the two of you? How much do I have to worry about you when I'm addressing her?]
[I mean, if she's that much of a package of bad news, are you in trouble if things turn violent, should I try to split you up first, tell me how this works, you appear to be an innocent bystander.]
[I'm not a witch. I'm some other stuff,] says Bella cheerfully. [Glory's from far away? My magic's from farther away. It's a really, really long story.]
[If there's nothing more you want than to get rid of her, you should be all over the possibilities I am offering via fancy offworld magic. Look, how much do you know about demons and so on besides the obsequious kind that do her shopping?]
And:
[Hey, Giles, two things. One, can you please see what there is to see on the subject of a hell god named Glory or Glorificus, her relationship to her mortal vessel, and anything to do with the Key? Two, Soph did not exist until a couple of hours ago, I am the only person unaffected by the corresponding memory-alteration, and there is some interpersonal fallout as a result.]
[...I'll, er, I'll look that up,] says Giles.
[Thank you, Giles.]
[I have an aura of menace. It's very impressive and makes people who don't know better think I'm a hellcreature of some kind. You'd have to really stretch the definition to qualify me as one, though. Slightly less cheaply, I can conjure up arbitrary nonmagical physical objects. Or magic ones, but they're trickier.]