When she wakes up one morning, the world has changed: she has a husband, two children, and, most importantly, many more years behind her. It turns out she didn't transmigrate through time. She hit her head and lost her memory.
Never mind. She can start over from scratch. What matters most is living in the present.
Her relationship with her husband is distant? That won't do. She needs to rely on him to get by. No problem. He's so handsome, she can just fall in love with him all over again.
Darling, just you wait. I'll show you what I've got.