invented to keep out the cold
She can see the stability of her Detect Magic firming up, her grasp on it solidifying as the magic bends more easily to her will. She — doesn't just start blurting out everything that comes to mind, she can see that that would be unwelcome right now, and that's not what the Geas actually meant. It was words, and words are an imperfect medium to convey her meaning, but that's fine. If she stands like... this... and angles her head just so, Morgethai knows what is happening, and will understand what she needs to convey.
She thinks back over their conversation, tilting her head slightly and unfocusing her eyes in a half-remembered pose people use when they're thinking back. That should be enough for the Geas. There, and there, and... there... there are so many places she can suddenly see how to gracefully deflect, how she could have thought faster than her mouth could speak and directed the conversation as she wanted it to go, if she wanted it to go. (Her eyes open wide, her eyebrows rise, she closes them again and nods. A realization, as plain on her face as writing on a page at midnight.) That she does need to convey, but not before they start speaking again, it's not responsive to any particular part of this.
Could she deceive Morgethai now? Those little twitches before she the Geas, that incredible ability to see where she's going before she got there... no, that would be hopeless. Unsurprising. Wishes aren't that good, archmages are. ...Gallipsiwhoop was tracking her just as well, at least to her ability to discern it. She nods to the dragon, who is still watching her intently, quirking her lips in a smile as if conceding something. Good, that communicated.
And, of course, there's the spell. The first was amazing. The second showed her how much she was missing, and she only barely caught her Detect Magic in time. The third, she watches in all its glory, lost a little bit in the beauty of the magic, how it takes a gem and mere words and rewrites reality on such a fundamental level. What an absurd process. Her mouth smooths over, her eyes opening a little wider, and her jaw half-drops, admiring its beauty. Morgethai surely didn't need that, but the compulsion sits on her still, and what else is there to do? It's truly incredible.