A young girl is treated cruelly and held in miserable captivity for years by her stepmother, who murdered the girl's father. The stepmother also magically sucks most of the life out of a girl (or very young woman), who is turned old and thin by the act. This girl is also held in miserable captivity, both before and after the life-sucking.
In my opinion yes when the Queen eats a birds heart ( She probably killed the bird but it’s not shown when she kills the bird only when she eats the heart or which ever part )
We're not told that someone has cancer, but the mother of a young girl dies from sickness. We see her looking very sick in a way that a cancer victim might.
Although not explicitly, there's a slight implication that Ravenna and Finn, have an unusual relationship. For instance, while Ravenna gets undressed entering the basin, her brother glares at her naked body implying that he's quite used at the view of the latter.
No, but someone is in danger of it when she has no recourse but to jump into the sea from a great height; she could easily have landed on cliffs. She emerges unharmed.