The smell of nail polish can make a bird very sick so I would say leave the birds out of the room untill you can't smell ANY paint inside the room, make sure there's no paint chips on the floor the birds can nibbled on.
I would leave the room for at least 3 to 5 days or more, maybe try baking some fresh bread and leaving it in the room to give it a more clean fresh smell? lol sorry but I can't stand the smell of paint haha.
I don't know too much about cockatiels but I would boil and leave the egg in the cage till she gets bored of it, maybe add some more toys in the cage so it gets her mind off laying/heat and more into active and fun things, maybe some extra nutrie berries lol.
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