The general inference is as follows: In that childhood car accident, Jenny (Sophie) died and Monica survived. Because of the deep love between Monica and Sophie sisters, under the influence of the heavy mental blow brought by the car accident, Monica subconsciously regarded herself as Sophie and lived for Sophie! Everything she sees is influenced by this subconscious mind, so she sees herself as a French (Sophie).
When all kinds of pressures from work hit her face, her mental environment was turbulent, and there were gaps in everything that had been covered up. Monica, who noticed the strangeness, continued to investigate, and gradually found that everything began to be different, even her appearance. Also turned into another person (this is what the real Monica looks like). These changes are carried out entirely in her heart, and there is no outward expression, which is why when she feels that her face is half-open, the people around her have no abnormal reaction.
(In addition, it was also because of her deep impression or deep love for her biological mother that Monica grafted her biological mother's appearance onto her adoptive mother in Paris.)
The little Italian girl who appeared like a ghost in the middle is Monica's id, because She went to live for Sophie, so I have always maintained the appearance of a child, which can be verified later when Monica turns into the little girl.
In fact, it is always Monica in the film. Different appearances (including Sophie, Monica in the transformation, the little Italian girl) are just changes in Monica's inner cognition of herself, which is why she is in the Italian hotel. She looked different when she checked in and when she checked out, and there was no reason for any abnormal reaction from the outside world, and she changed from a child to an adult woman on the train, and the passengers in the same car did not respond.
At the end of the film, Monica and Sophie wrote things together and smiled at each other, indicating that Monica has recognized the situation, and her good sister Sophie is still alive in Monica's heart.
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