That’s also the most common tactic when lying, leave out critical information that changes what you’re saying.
“I’m not armed.”
You’re not. But your bodyguard is and he can get you weapons fast. Or you have a bracelet / spell that lets you summon weapons in an instant. In either case you CAN be armed, very quickly, but when they asked you if you had weapons, you were speaking truthfully.
Also she only mentioned the ones on her amr, not the ones around her neck or her earings etc. So not only leaving out a detail, but also not being entierly accurate with the ammount and location of the stuff either.
Course, no one has mentioned that the demon is tehcncially working for a good friend of hers so is actually on her side and gave her time to ‘prepair’ for this ‘kidnapping’. Or the fact that backup is enrout.
The other benefit is that she’s learned the limitations of Mr. Proxy, that he was only reading her body language and not that he had the ability to See Invisible, unless he too is omitting things he knows (perhaps less likely, because Death and him don’t have the intel that she’s been studying magic and thus is a danger herself).
From a fantasy standpoint, one could get away with such deceit in regards to “lie detection” spells because she is being truthful. Jewelry is a vague term, and while it DOES have offensive use, it is still jewelry. So again, there is no lie for any magics to spot.
Since there is no reason to doubt her, there is no reason to employ such magics.
You have to give Kate credit for thinking fast on her feet. But then again, considering what she’s been through and the kind of life she lives, that’s kind of a requirement.
Sometimes the best bluffs just require one omitted word:
“Yeah, I’m wearing a whole lot of invisible
armedorihalcum jewelry.”