An Invisible Sign of My Own (2009)

Based on the book by Aimee Bender. Math whiz Mona Gray has elected to systematically withdraw from life after a mysterious illness leaves her DAD all but a shell of his former self. When she gets a job as the math teacher at an elementary school, she discovers she has an unorthodox talent for teaching and finds herself thrust back into life again, with children to care for, a man to love, and a reason to live…