All right then. He can take responsibility for this mess of His making, without too much cost.
If this mortal becomes His cleric, Irori will be able to find her again in time. Eventually He will get around to questing some powerful caster pledged to Him, to bring her forth. When? Whenever that becomes convenient to Him. It may be a hundred years, five hundred, it matters not to a statue. If the mortal then must leave all she knew behind her, and begin again, well, one must overcome such challenges along the Way.
But Irori should not make her His knowing cleric. She is near something more than powerful enough to read her mind, and see the knowledge in her if she knows; or maybe just notice by normal means, if she stops being so afraid. And then this other being will, say, planeshift the mortal into Abaddon instead; or attempt to torment her into giving up Irori.