Promise eats muffins. Mortal food is weird, but she doesn't make faces about it. (She is not allowed to complain about what she's fed.)
"She's real," Thomas says, sounding stunned.
"What are you talking about? You saw her! You were there too!"
"I thought it was just... a daydream, or something."
"Nuh-uh."
"This is nuts."
"I know!"
When the muffin is gone, Anne asks anxiously, "Do you need anything else, fairy lady?"
Oh fuck yes she needs other things. She's not going to be able to answer followup questions, but her options are "nod yes" and "stare blankly". She goes with the first.
Ambiguous. Anne's the only person Promise can stretch to count as a court member, right now; but another name could easily drop and then Promise could nod or shake her head for them too. But not talk. She still couldn't talk, not without pretty fortuitous happenstance. Promise shakes her head, slowly.
Thorn's smarter than that. But Anne didn't ask, so Promise can't even shake her head.
All of these suggestions get their own headshakes. Especially the fairy magic one. Promise can do no sorcery here.
Nod.
Headshake. For conservative definitions of need, Promise doesn't currently need anything.