'I'm right.'
Seeing Lucivar and Caldaros stumbling to this place confirmed Leandra's thought.
Keeping close to Ciri was the right choice to be where Lucivar would be.
Ever since her confrontation with Lucivar in Kalinan City, she has been going down in a rabbit hole of figuring Lucivar out. To understand how he came to turn out like this. All spaces in her mind were filled with the thought of Lucivar.
Just like he said back then, she might be the only one who could understand him.
She wanted to be the only one.
So that she could help Lucivar better.
Not so much as to return to how he once was, but to control the darkness better.
And now, the fact that Lucivar and Caldaros stumbled here meant that she was beginning to understand him more than the others. Additionally, since those two ended up here, near Ciri, that means everything has gone according to Lucivar's plan.
Like always, he's a meticulous and terrifying planner.
Becoming better as he grew.