Because Keiran is widderkin, his father, the High King, seeks great secrecy and so doesn't want to widen the already growing number of elves being involved.
At the moment there's no one in a fit state to help, with the triads back-lashed, Maynor in a healing trance, and Uirebon clobbered.
The High King can't really send anyone new, or even go himself, until he finds some way to locate the group.
Whoo! After migraines, memory changes, Rhys taken twice and now the Spooks, there's a great deal of negativity and suspicion against the perpetrators. - a big task for any emissary.
We'll see!