"If we write all that out and you read it under a truth spell, is anything funny going to happen? And I mean anything at all, because I know you're a song-sorcerer, I don't have all day, and I cannot hold your hand through three attempts to exonerate you if I get the slightest suspicion you are interfering with the first."

Obviously they're going to have suspicions of the first, or it's going to turn out that that surprise you were an idiot if you thought they cared, or they'll dismiss it midway through if it looks like she'll pass it, or whatever. But it's not going to come from her.

"I can say that under a truth spell without interfering with it."

What if they give her a written out version that has those phrasing and also the same questions phrased a little differently, does that throw her or is she able to read it all the way through?

No, that one's easier actually. After scanning it she can read it without hesitating, stumbling, or singing.

Absolutely no singing. And no humming. No musicality of any kind. 

...fine. "Great. Thank you. You're under arrest for resisting arrest, but that's not a capital crime, and we'll waive it if you are willing to testify that all the treason came from Valia."

She's not an idiot, if they want her to testify that someone she associated with committed treason they'll have to try harder than that. She'll take the jail cell until they decide to tell her she's being executed or sent to hard labor after all, or possibly until they torture the confession out of her if that satisfies them.

Not allowed anymore, which honestly suits Meritxell fine, there's no artistry in it. She writes up that either the song sorcerer is in fact completely innocent or she's got some nonmagical way of beating truth spells. They can still get her on the resisting arrest, at least.

Alicia settles in for a very uncomfortable stay. She has friends that would feed her if they knew, of course, but she's hardly confident any of them know the crown caught her or that the guard would let them through to do it. Hopefully if the guards come into her cell they'll do it in small numbers, since a larger group could snap each other out of it before she suggests it's not worth their trouble.