Hello. You have not shown the text to which this question is related, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
It is only possible to answer this question by reading the text. However, the best way to observe that Mary is starting to change is to show a behavior or thought that she is abandoning in the course of the story. In that case, to answer that question, you must identify this modification of Mary, where she no longer presents a thought, an opinion, a desire and even a behavior that she used to have.
