@Mark26 @Lina53 right, I'm not saying it's a good system, but stays cancelled within 24 hours of checkin are allowed to review (this was done to allow people to call out bad actors who had places that were so awful that they did not want to stay after arrival). Same as when CS allows a host to cancel a guest for rules violations but then both get the opportunity to review.
So, Lina's review could say "xxx booked our place xx days/weeks/months ago but because of a broken finger chose to cancel their stay xx hours before arrival. We were disappointed with the last minute change but wish them well with recovery and future travel."
There is no good answer for how that review will go, but it is an option for both the host and the guest. And at least if you have a guest that repeatedly has extenuating circumstances cancellations then hosts can get a heads up that this is a system they are possibly abusing.