Answer: It's difficult to diagnose a plant problem without actually seeing the plant. Temperature and light changes can cause the leaves to turn inward, but so can feeding by mites or mealy bugs. Be sure to carefully check the undersides of the leaves for evidence of an insect infestation. If you can find none, I suspect the plant is just adjusting to the winter weather which brings cooler temperatures and less sunlight. Continue to give it excellent care and any subsequent growth should look normal.
Best wishes with your gerbera.
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