Fighting to Survive in the Apocalypse

A female special agent from the interstellar era is betrayed by her partner and dies on a mission. She wakes up amid Earth's apocalypse 2,000 years earlier, in the body of a little girl whose identity is unknown. After what feels like a dream, she decides to start over. She quietly works hard to find a way forward in a chaotic world and live a low-key life. Can things really go that smoothly? P.S. This is the story of the heroine's journey of hard work and growth, not an unlimited-flow story. The heroine is tough, but she has her weaknesses too. That's perfectly normal.