"- I don't think I've told you anything except about magic. Everything I told you was true and not misleading or anything." That should be enough time for an illusion and a Dispel. "I don't know of anyone else having told you anything untrue or misleading either. I ...am not entirely sure I understand the question as phrased but I think yes, we have been honest?"
Elias Abarco has a problem. The problem is that Keltham is presumably thinking he'll use Detect Magic to check whether his enchantment's still in place and that will totally work, it'll show an illusion not an enchantment and if Keltham can read it, game's up - and even if he can't, he can learn how in the future, they can't teach him illusion and enchantment swapped, forever - he can put the girl under another enchantment easily enough but the illusion'll still be there - what he needs is Greater Magic Aura, which can put the girl under the exact right apparent magical signature, but he didn't prep that and doesn't have time now -
There's got to be a scroll of it somewhere. He doesn't know a place that - there are magic shops in Absalom that sell everything -
Elias Abarco vanishes. This is noticeable to about half the assembled persons but they all have good poker faces.