At about 10:00 as Madeline walks towards the fireplace, you can clearly see that the logs Mrs. Blythe just put in the fireplace and lit are now unlit. The small flame that was there has now gone out. There are no flames in sight. After Mrs. Blythe responds to her and the camera flips back over to the fireplace where Madeline is standing (at about 11:36), suddenly there's a crackling fire going in it.
Madeline states that she came to the cabin because she saw lights on in the windows. She later says that she can't see out the windows, as the shutters are closed.