Rilla of Ingleside [Anne of Green Gables series #8‪]‬

The Blythe children are almost grown up, except for pretty, high-spirited Rilla, who is almost 15. She can't think any further ahead than going to her very first dance at the Four Winds lighthouse and getting her first kiss from handsome Kenneth Ford. No one can resist her bright hazel eyes and dazzling smile.
But undreamed-of challenges await the irrepressible Rilla when the world of Ingleside becomes endangered by a far-off war. Her brothers go off to fight, and Rilla brings home an orphaned newborn in a soup tureen. She is swept into a drama that tests her courage and leaves her changed forever.