The narrator call Mademoiselle Lalande a "queenly apparition" when he first sees her because he felt that the lady is a magic in a form of a woman. I hope my answer has come to your help. God bless and have a nice day ahead! Feel free to ask more questions.
I feel that it is the first one, she is losing interest, because a lot of the rest of the story suggests she is not all the interested with him.
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