Depends on the construction of the ceiling but best case scenario is: as long as it was a one off and all is allowed to dry out properly (perhaps remove downlights so air can flow into the cavity) you should get away with perhaps just a light sand and then repaint/touchup of the ceiling.
This is the first since we bought the place in September and it was very brief, by all accounts. At the very least I plan to pop the lights out. I've told her to stick the dehumidifier in there and turn the heating on.
Depends on the construction of the ceiling but best case scenario is: as long as it was a one off and all is allowed to dry out properly (perhaps remove downlights so air can flow into the cavity) you should get away with perhaps just a light sand and then repaint/touchup of the ceiling.