Hello deharper, that is rather unfortunate you watered and fertilized it. Nothing to do for now except to observe if it affects it. With Plumerias, you cannot rush the cuttings. It will wait it out till if feels the growing condition is what it needs.
Since you are in the Pacific Northwest, if it were mine, I would bring it out in a protected area where it will feel the temperature change and get as much bright light it can get. But please, do not water again, it will hasten its demise if you keep watering when it is not ready.
It is a tropical succulent. If it is in full leaf and already actively growing, it can take frequent watering as long as grown in a grittier media. But if it is still not fully awake, you are risking rotting at the base and also black rot at the growing tips of your cutting. I would not even dare mist the cutting in you area since you will have already better humidity levels there, but air around is still too cool than what it likes. What it needs now is more light and more warmth, to encourage leaf/root formation. Fertilizing too early will also just cause undue fertilizer burn.
So again...more patience...and observe how it goes, hands off, no watering, no fertilizers yet. Good luck on your cutting.
