Preteen Means Inbetween is Linda Lewis' book that asks the why do boys have to be so immature?
"Eleven-year-old Darlene, who is big for her age and looks considerably older, must adjust to a new way of life when her mother gets an important new job which takes up most of her time and the family moves to Manhattan."
eh nothing great...another pre-teen book from the 80s/90s where the main theme is working mom guilt, with a specific plot point about the mom not making a halloween costume and this being particularly devastating for the main character. grow up make your own costume.