"This time, you sent the trembling fawn to find me. I did not expect to see those doe-eyes peering at me from across the world." (Suriel, acowar)

Mystics seek a higher consciousness, to become one with the divine. In tog, beings of a higher consciousness are what characters referred to as gods. And what did we learn about them from the memory in the witch mirror?

They had no forms. They were only figments of light and shadow, wind and rain, song and memory. Each individual, and yet a part of one majority, one consciousness. (eos)

If mystics become one with the divine, then this might mean they become part of that greater consciousness, travel like figments of light and shadow. This could explain why Elain is paired with the half-wraith twins and it’s possible her mystical travel might mimic how Feyre moves when she is connected to the Cauldron through a living bond.

I could not remove my hand. Could not pry my fingers away. I was being shredded apart, slowly, thoroughly. I flung my magic out, desperate for any chain to this world to save me, keep me from being devoured by the eternal, awful thing that now tried to drag me into its embrace. Fire and water and light and wind and ice and night. All rallied. All failed me. Some tether slipped, and my mind slid closer to the Cauldron’s outstretched arms. I felt it touch me. And then I was half gone. Half there, standing silently next to the Cauldron, hand glued to the black rim. Half … elsewhere. Flying through the world. Searching. The Cauldron now hunted for that power that had come so close…And now taunted it. [...] Time seemed to slow and warp. The dark power of the king speared toward us. Toward that clearing where I was neither seen nor heard, where I was nothing but a scrap of soul carried on a black wind. (acowar)

Feyre’s connection to her form is shredded and her tether to the world slips as she is embraced by the Cauldron. She travels with it across the battlefield, a scrap of soul on a black wind, and is forced to watch tragic events unfold. Trapped by the Cauldron, Feyre was not able to step out of its black wind shadow to help, but Elain was.

For a moment, I thought the Cauldron had answered my pleas. But as a black blade broke through the king’s throat, spraying blood, I realized someone else had. Elain stepped out of a shadow behind him, and rammed Truth-Teller to the hilt through the back of the king’s neck as she snarled in his ear, “Don’t you touch my sister.” (acowar)

And this is probably why Elain’s rose is half-hidden in shadows next to the Mother. Her Cauldron-blessed powers might allow her to be half-there, half-elsewhere when she becomes part of that greater, divine consciousness.

Her gaze shifted to the carved wooden rose she’d placed upon the mantel, half-hidden in the shadows beside a figurine of a supple-bodied female, her upraised arms clasping a full moon between them. Some sort of primal goddess–perhaps even the Mother herself. (acosf)

It’s possible she used this power to locate the Suriel, which was practice for the main event: answering Feyre’s pleas and taking down Hybern in place of the Cauldron. Her Sight—a truth teller itself—likely activated Truth-Teller, guiding her to exactly the right place at the right time. The question is, since she is not bound like Feyre, did she then winnow (ie, travel like Hope through the Void, light cutting through the darkness) to save her family? And has she continued to help them in this way?

Islands of grass dotted the expanse, some so crowded with brambles that he could find no safe place to land. The tangles of thorns were a mockery of what might have been - as if Oorid had ever produced roses. Not a single flower bloomed. [...] Run, a small voice whispered. Run and run, and do not look back. The voice was female, gentle. Wise and serene. Run. [...] Run. Was that voice merely all that remained of her human instincts, or something more? She gazed at her reflection as if it would tell her. Something rustled in the thorns of the island, and she snapped up her head, heart thundering as she scanned for that familiar male face and wings. But there was no sign of Cassian. And whatever was in that bramble...She should find another island to head for. (acosf)

This small voice warning Nesta to run also reminds me of Elain’s warning cry to Feyre before she is Made by the Cauldron.

My sisters were shrieking over their gags. But Elain’s cry—a warning. A warning to—To my right, now exposed, Tamlin ran for me. To grab me at last. I hurled a knife at him—as hard as I could. (acomaf)