The Victory Garden by Rhys Bowen

Emily Bryce is the daughter of a wealthy family. Her mother insists on keeping her home and sheltered from the war. While visiting the convalescent hospital, she meets an injured Australian pilot and falls in love, but her mother finds him unsuitable and she's forbidden to see him again. She enlists with the land girls, a group of women trained as farm workers to harvest the crops, milk cows, and keep the farms running while the men are away at war. This allows her to move away from home and keep seeing her pilot. Eventually, he heals and is returned to the front and Emily finds a place she belongs in a small country village.
I had never heard of the land girls and it was really interesting learning their role in the war. I love how the friendships between Emily and the other girls grow and change and how they support and help each other. I kept hoping that Robbie would make a surprise return in the end. This was such a great book that was impossible to put down!