There is a word for what she feels.
Perhaps the word is sadness.
No. Sadness is a passing emotion. Fleeting and insubstantial. One felt sadness when an arrow was broken or a flowerbed died. It is not sadness.
Perhaps the word is anger.
No. Anger is a passionate emotion. Burning and bright. She is incapable of passion. She is numb to the power that anger brings. It is not anger.
Perhaps the word is grief.
No. Grief is a stage, a step in a series of steps. Greif implies both sadness and anger, but it also implies healing. She cannot be healed. Grief is the closest. But it is not grief.
Perhaps there is no word for how she feels. Her life mate is gone. She should be sad. She should cry for his loss. The humans killed him, she should be angry. She should storm up to the castle and demand that they restore what they have stolen. She has her foul. She should grieve. She should try and put Ronan to rest in her heart. She should stop searching the stars for him; she should stop speaking of him as though he is alive.
Eachna cannot.
There is a word for what she feels.
Perhaps it is lost.