My Brown Leghorn laid her first egg nearly a year to the day she was hatched! I had worried she'd never lay and egg, she was smaller, more skittish, and petite compared to the other hens, but man, she laid that first egg and suddenly seemed to fill out! In about two to three weeks, she started laying regularly and became the size of the rest of the laying Leghorns. She also mellowed the heck out and isn't near as skittish as before.
Starting to lay at the year old mark is possible! There is hope yet