Why does Aunt Alexandra visit Maycomb in chapter 13 of To Kill a Mockingbird?
As stated in other answers, Aunt Alexandra comes to stay chiefly because Tom Robinson's trial is impending and obviously it will be a tough time for the family; as Atticus puts it, 'the summer's going to be a hot one', so another adult in the family needs to be there continually for the children. This, at least, is the surface reason, but that's not all. Aunt Alexandra also feels that Scout needs a proper, guiding feminine influence in her life as she is motherless. Scout would have made do with Calpurnia, but Aunt Alexandra looks down upon Calpurnia for being both black and a servant.
Alexandra is dismayed at Scout's tomboyish ways and feels it's her sacred duty to mould her into the perfect model of a lady in every respect. As far as that goes, she appears to be fighting a losing battle from the start. However, while Scout...
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will probably never be comfortable wearing pretty dresses and indulging in ladylike occupations like sewing, she does come to learn the importance of behaving like a lady: that is to say, being restrained, dignified,and courteous.
The perceptive young Scout guesses that Aunt Alexandra's coming to live with the family was really her idea and not Atticus's, although Atticus doesn't represent it that way:
I had an idea, however, that Aunt Alexandra’s appearance on the scene was not so much Atticus’s doing as hers. Aunty had a way of declaring What Is Best For The Family, and I suppose her coming to live with us was in that category.
Scout suspects, then, that Aunt Alexandra has more or less foisted herself upon the family, but that doesn't mean that Atticus, at least, is not grateful for her presence at a particularly testing time.
Why does Aunt Alexandra come to visit in "To Kill a Mockingbird"?
In chapter 13 of To Kill a Mockingbird, Aunt Alexandra unexpectedly arrives at the Finch house while Atticus is away. Scout and Jem are surprised because their aunt rarely comes to visit. Aunt Alexandra gives a reason for her arrival:
"Well, your father and I decided it was time I came to stay with you for a while."
This statement makes Jem and Scout nervous. "A while" can mean any length of time. They wonder how long their overbearing aunt will stay. She gives them more details about her reasons for visiting:
"Jem's growing up now and you are too," she said to [Scout]. "We decided that it would be best for you to have some feminine influence. It won't be many years, Jean Louise, before you become interested in clothes and boys—"
Scout does not like Aunt Alexandra's reasons for coming. After all, she reasons, Cal is a feminine influence on her life. Scout does not think she will ever have an interest in clothes. She also thinks that it will be a long time before she is interested in boys. Despite her unspoken protests, Scout does not dare contradict her aunt.