Update: Daughter found her in the corn field next to our house, almost by pure coincidence. Her tail is broken right after her hip and she has a very slight pneumothorax. We assume she was hit by a car somewhere else and either hid in the field or took so long to crawl there. Apparently, injured cats don't tend to return to their home and rather hide and die.
She's been in clinical care for two days now and we'll take her home today. Her tail is paralyzed from the hip, but she can keep it unless it turns necrotic.
From now her and her brother get their GPS trackers back. Thanks for reading my blog.

tl;dr: Found cat, injured by car, vet fixed her up but her tail remains paralyzed.

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