You were killed by Amarantha 40 years ago...for no reason really, except you were Rhysand's wife. You were resurrected a week before the final battle with Hybern because Rhysand thought Amarantha killed you because you knew something that could be useful against Hybern, it turned out you were murdered at Amarantha's whim. As were your two teenage children you had with Rhysand

You avoided Rhysand for that week...because you didn't want to ruin his new life with Feyre. Feyre respected and admired you for that even though she knew you and Rhysand still had feelings for each other. Feyre often heard you waking up at night in "your room" in the tent as if Amarantha was killing you again, stabbing you in the chest, which caused blood to pour into your lungs and throat...and that was it

After the battle Rhysand was badly wounded. Feyre and you got to him as fast as you could. Fortunately, Thesana medics with healing powers and the rest of the princes saved him.

Despite the casualties after the battle, in all armies of manors after the battle a ball/party was organized for those who could still walk. ... Feyre and Rhysand pov Feyre had looked at you with envy when you had attracted the attention of most princes when you danced with the Helion, Feyre had heard from Rhysand that you had been successful, but Feyre did not expect to be completely ignored, even though she was now the Duchess of the Court of Night for you, and you were literally nobody now. But there was still a line of princes and their relatives to dance with you