She also wanted to be mischievous, to make her father worry, to make him pay more attention to her. But she held herself back, because it "shouldn't" be that way. And she always secretly blamed Mera for her mischief, which added a bit more to the dark circles under their father's eyes.
And this jealousy even extended to... Kain.
Yes, she was jealous of Mera, but not in a romantic way.
She was clearly the one who met Kain first.
She was clearly the one who brought Kain to them.
But then, Mera was the one who got closest to Kain.
She stood there, watching them side-by-side from behind, like a shadow gradually left behind.
Kain was a very strange, very independent person. She didn't have that kind of emotional attachment to him either, only admiration and a desire to cooperate to achieve her goals. And she thought Kain would be the same, which made Myra feel a little balanced.