Naturally it's not like the fire crane girl had any ill intent towards Liliana, not in the slightest, what made her feel bittersweet is the fact that both of her sisters got better results out of their latest adventure, in other words the challenged they faced.
Ivy derived more new spells and techniques than her sisters, she even adapted Phoenix Dance making her fighting style the most complete among the three of them, her development perfectly went along with the role she takes as she is able to respond to any situation that might present.
Liliana had a straightforward and quite effective development, she became overwhelmingly stronger, but that doesn't mean she was simple, since unlike her sisters she could both keep her wings out and use the "mixed mana" state in which they extended and boosted her strength at the same time, which is what she did during the first half of the fight.
