How does Margot react to the relationship between Anne and Peter? Why?

Anne used to think that Margot liked Peter which made stifled her intimacy with Peter and every time she went to see Peter,it felt like she was hurting her sister without intending to do so. However, Margot seemed unperturbed by Anne and Peter's developing friendship, she did not want Anne to feel sorry for her because she was used to being the odd one out. Eventually Margot wrote a letter to Anne in order to make a clean breast of her feelings. It was a heartfelt and honest letter in which she wrote that their friendship had made her a little jealous but this jealousy was neither directed towards Anne nor Peter. She was sorry that she had not found anyone with whom she could share her thoughts and feelings. She also felt that this situation would remain unchanged even in the future. But that did not deter her from wishing the very best for the two of them so that they were able to find peace and trust in each other. She writes that they were already missing out on so much because they were cooped up in this annex. Margot could not have gotten as far with Petter as Anne had because she needed to feel very close to the person before she could unburden her heart. She'd want to have the feeling that the other person understood her thoroughly even if she didn't say much. For this reason it would have to be someone intellectually superior to her and in this case Peter did not fit the description. So she reassured Anne that there was no need for reproach herself thinking that she was taking away something Margot was entitled to because that was farthest from the truth.