April’s real name is April Hall, but she likes to go by the name April Dawn.
Her name was April, but she often called herself April Dawn. (p. 11)
April is described as thin and “palely blond” with hair “arranged in a straggly pile on the top of her head” and light freckles (p. 6). She is friends with Melanie, who has a four year old brother named Marshall.
The Professor notices that the two girls are interested in the “plaster reproduction of the famous bust of Nefertiti” (p. 7). These and April’s other friends that take part in the Egypt game lend her a sense of family that is lacking because she feels abandoned by her mother.
To cope, “April glamorizes her mother's activities, looks, and behavior to try to comfort herself but is angered by her mother's absence” (enotes characters and themes). April Dawn seems much more grown up, glamorous, and mature than just plain April.
Quotes taken from the searchable Amazon text below.