In the scene where "Gracie" lets "Rhode Island" in to have hot chocolate her hair is soaking wet. It is still wet when Gracie shows her to the door and says goodbye - however when the camera shoots her walking back from the door to her bed she has dry hair!
That's not true. When she closes the door, she has a robe on and her hair is wet. But after she closes the door, her hair is dry and she is also wearing her nightgown. (That means that it's later.)
If you will remember, when she walks her to the door she is in her robe, and when she gets into bed she is in the nighty, so you don't really know what she did between closing the door and getting into bed. She might have dried her hair or something.