Looking into the Mirror.

She can see Mirror's grand strategy for the tournament: She wields the [i]Invisible Sword[/i]. Her blade is concealed behind air and so an opponent cannot judge its length, but neither can she wield its Noble Phantasm. She goes through each fight trying to conceal her secret, saving it for the battle when she truly needs it. Some opponents come close. Marcina guessed correctly, naming the control system that enabled Mirror's movement - poor fool, she saw the sword and missed the claws.

Solarel sees the truth. The Gods-Smiting Whip is the same manner of creature as the Supernova. Each tail contains a Crystal Fire Reactor. She separates them out on independent drone chassis, allowing them to burn at full effect without interfering with each other. Mirror has prepared a divine wave, an all-consuming energy blast, an attack sequence that will destroy her utterly. Poor Mirror. She kept her secret well, but it was her misfortune that Solarel had fought against someone wielding an inferior version of her idea. She was now inoculated against technology shock, knew to look for Hybrasilians attempting to win through engineering.

Solarel, too, has had a grand strategy for the tournament. Hers has been the [i]Gate of Babylon[/i]. Every battle has seen her draw a new treasure from her arsenal. She has replaced her God twice, doing battle with forest fires and blizzards and kessler syndrome, fought with one blade and two, with lance and sniper rifle. Any of the techniques she has shown could be an entire path of mastery for another pilot. Every battle has expanded the possibility space for who she could be. And now, at the end...

No, she was not going to reach for [i]Ea[/i]. She was not a king. She was a faker. Her true self was not a declaration of self. It was a mirror, Mirror. And you are the fairest of them all. If you truly know her you know she's not going to come prepared for you. She's going to come [i]as [/i]you.

She has stripped the armour from the Aeteline, exposing its naked chassis and superstructure. Mirror would not engage in attritional combat, so everything must be sacrificed for speed and power.
Nine combat drones. Not beautiful, perfect vessels of crystal fire reactors - hers are pale imitations, angular and jagged interceptors with autocannons. They are shadows, useless if not hunting their true manifestations.
Likewise, she has made a poor copy of Mirror's control system, the voice control theory she speculated about long in the past. Not a dedicated path of mastery, not a primary combat technique, but enough to let her surpass the limits of the Mind-Impulse Link for key maneuvers. 

Some people loved what they were not, were attracted to opposites. Solarel was attracted to what was the same as her. What felt within reach. What she felt she could become. What she could melt into. The transgression of wielding the same weapons. The same tactics. The same Gods. Some people loved the clash of civilizations, the Zaldarian against the Hybrasilian, but Solarel lived above all for the Mirror matchup. There was no beauty like symmetry, no love like reflection, no way to show someone that you understood them better than becoming them. 

The Sage had said Speak Not. This, then, was the only way to show her love.