One Christmas With A Wallflower by Nadine Millard

Jane Darington has dipped her toe into the marriage mart once before and has no plans to do so again. Not after she was humiliated so badly. Not when she had watched from the sidelines as her younger sister got her happy ending instead.
She’s planted herself firmly on the shelf with no plans to move from it.
But a chance encounter with a dashing stranger leaves her wondering if maybe the life of a wallflower isn’t for her after all.