In a third book about Lila, the girl sees all her Great Ideas go unexpectedly wrong during the first month of school. The likable Price School kids are excited about sixth grade. Lila is hoping to be student council president, but when best friend Gayle is nominated, Lila becomes her campaign manager— with unfortunate results. Meanwhile, the class is taking care of egg-babies and Lila's day-care center fails after one of the eggs is kidnapped. With her mother distracted by a new job, and with friends Gayle and Michael excluding her, Lila pauses briefly to wallow in self-pity before taking charge of improving her situation. Some of her Great Ideas do work out after all: Gayle is elected, while Lila becomes editor of the school paper. De Groat's appealing b&w illustrations reveal a diversity in the class that's not evident from the text. Though light, this touches on serious issues of responsibility; McMullan deserves praise for creating its well-rounded, individualized characters. (Fiction. 8-12)