In the winter where many of her friends died, Patchouli is running outside. Normally yukkuri would freeze to death, but Patchouli is still fine.
From her story, Patchouli's mama and papa had found a secret magic tome and now Patchouli is immortal. Surprisingly, the method is really simple so the clan tried it too.
Even though it's winter, they don't need to worry about losing the little ones. They made babies until the babies flowed out of their nest.
The babies cried from cold, from hunger, from getting hurt by predators, from being swallowed and fallen from the sky with shits after passing crow's digestive system.
Seeing something is wrong, the clan cornered Patchouli. True they don't die, but this is not easy at all.
Patchouli told them, yes, they won't die even without eating. Won't die no matter how they're hurt. No need to fear disease anymore.
There's no way to remove the immortality, not that Patchouli cared.
Patchouli has had worse experience before, but this is all better than being trapped inside her house because she's too weak.