sisters grabbed and locked her into the of neast that can impregnant human women. That is rape, and traumatic experience probably suppressed. Then see the child she anticipated is a direct result of rape and had no idea was possible to bear a dog's child. Add on rumors of a legitimate cousin that could replace her as queen, and the child that shows the rape actually happened rather than the person she loves and married.
The karma part is from the fact that the cousin is definitely the replacement. Her experience of taking someone's lifelong fiance came back to her. By being crazed and forgotten by society would be how she happily sends someone that is described as spoiled but crimeless to be sacrificed.
is it ever explained why nasha gave birth to a beast? is it just infidelity, karma, & why did she go crazy at the end?