What is the main conflict in The Liars' Club by Mary Karr?

Mary Karr's The Liars' Club, published in 1995 in New York is a memoir of Karr's turbulent childhood in the fictional eastern Texas town of Leechfield, and later in Colorado. Karr's immediate family consists of her sister Lecia, two years older than she; her father, Pete Karr, who works at an oil refinery; and her mother, who is emotionally unstable and hates living in Leechfield.