When does April's mom write her a letter in The Egypt Game?

After
April goes to live with her grandparents, she finds it challenging to settle in to her new
school. By the time Halloween arrives, she has drawn several other children into the Egypt game,
has cut her hair into a flattering bob, and started to get on good terms with her grandmother.
Just when she is beginning to feel comfortable, however, she receives a long-overdue letter from
her mother, Dorothea. Aprils mother happily reports that she has gotten married and is moving in
with her new husband. Because his apartment is small, Dorothea writes, she is not moving all of
Aprils things. Instead, she is sending them to April, who is devastated by the news and takes it
out on her grandmother by screaming at her.