Wasteland Apocalypse, Became the Cannon Fodder Female Supporting Character

What kind of life will the little demon king, sent to a nunnery to 'cultivate her mind and body,' encounter after transmigrating to a wasteland apocalypse?

After living in the wasteland world for 12 years, during a chance outing scavenging with her sisters, she overhears them talking about a handsome guy they've just met.

Hearing the handsome guy's name, the slacking Shen Tangtang suddenly realizes something terrible—she seems to have transmigrated into the unlucky female supporting character who provides the golden finger to the female lead.

And that golden finger is obtained from her corpse after her death by the book's white moonlight, who is also her sister.

Isn't this outrageous?

Is she, Shen Tangtang, going to freeze to death from mere cold weather?

Oh, no— she needs to contract the space first.

PS: Lone wolf, female lead not controlled by the plot.

Lightning avoidance: Two non-canon novels collapsed and were mashed together, resulting in a chaotic world with all sorts of bizarre elements.