Lilli knows that the runes are something to do with the awakening trap, but that's fairly obvious. Haven't solved them - I rolled a 2 on the d20 with the last Arcana check (which Lilli has +17 in).
I know who made the trap, but I don't think that is necessarily going to help (unless maybe Lilli tried History (+10) to try an recollect the caster previous methodologies).
There isn't time for free passes/ successes with a ritual as the gargoyles are waking up.