Cream and coffee mix easily. Joy and sadness mixes easily. The similie represents how emotions can change/mix considerably.
Yes we could predict that they would be reunited later in the story because no one can live without their parents
As with any author's decision to use 1st person, her intention most likely -- in this story -- was to get her readers to go along for the ride into madness and cultivate a certain amount of sympathy for the narrator and her plight. The constant use of "I" puts readers in the narrator’s head and allows them to empathize with her.
1 The cars raced on the tracks. The hunter killed the animal by following its tracks
Sorry I don’t know two for felt
3 The survivors lit a fire to stay warm. The soldiers had to fire their guns.
4 I asked my friend to scratch my back. We had to back up to make room.