A 14-year-old girl from Mumbai presents to the pediatric clinic with her mother for assessment of pubertal development. On examination, she has breast tissue with areolar enlargement and a small amount of raised breast tissue (approximately 2 cm in diameter), with the areola appearing darker than the surrounding skin. Pubic hair is present but sparse and lightly pigmented, confined to the labia majora. Axillary hair is absent. Menarche has not yet occurred. What is her current Tanner stage for breast development?