A Miracle of Hope, Amish Wonders Series by Ruth Reid and published by Thomas Nelson.
Lindie Wyse is pregnant out of wedlock and thinks an arranged marriage is the only way to preserve her future. Josiah Plank is certain he'll never love again, but he needs someone to care for his eight-year-old daughter, Hannah. The two take on their arrangement tentatively at first but soon realize they are each in for more than they imagined.
Lindie experiences a breakthrough with Hannah when she recognizes Hannah's special gifts, but a risky pregnancy and serious health issues threaten to demolish the foundation Josiah and Lindie are building. Will their growing love survive despite their struggles, or will their hearts become as cold as the northern winter?