A Stranger in Honeyfield by Anna Jacobs
1916: Bella is working as a Voluntary Aid driving ambulances in England when she gets engaged to Philip, on leave from fighting in France. His family strongly disapprove of her but the two of them are happy together. Georgie, Philip's sister, is in trouble having broken her engagement and fled from her bullying family. Who can she turn to for help when she needs it most? When the worst happens, Bella must manage on her own, though there are shocks and dangers she did not foresee ahead. Thankfully, Philip's best friend Tez, injured in France, steps in to offer assistance. Can he also help Bella build a new life?