Well, there is no answer for this. All she had to do was do it. No use in wasting her time wondering if it does work or not.
"I seek the power and strength given to me by the mythical white tiger, Celestial Warrior Min. Come back to me and remember where you pledged your loyalty!"
Min was still unconscious, and it was as if she did not hear anything from her at all. The crown prince said that the command is always useful, and the celestial warrior commanded by the high priestess is always bound to do whatever it was, no matter where, when, or what state of mind the warrior is, at that time.
Yuna could not hide her disappointment as she looked at Min, who was in a peaceful state of sleep. She was aware of her mental slip-up. She cursed herself as she thought of saying that the power and strength were given to her by the mythical white tiger.
She thought, "Perhaps I am not strong enough? What if I am not strong enough to control that white tiger power?"