There I Find Hope by Jessie Gussman

Sunday Landry suffers the most painful loss possible – the loss of her son. She closes her candy shop and moves back in with her mother, barely able to get out of bed. What’s the point in living?
Noah Emery had a crush on Sunday in high school, but she didn’t notice him, choosing someone else and eventually having his baby. Now that Noah is back in Strawberry Sands, Sunday again has too much on her mind to notice him, and he can’t blame her. He can’t imagine losing a child. He wants to help her overcome her grief, so he starts to write to her.
Sunday needs a purpose, and the letters she’s been getting give her a reason to get up each day. She’s able to pour out her grief, and her anonymous pen pal has some wisdom that helps her pull out of her depression. If only she knew who he was, because she thinks she’s falling in love…