Her approval
From all the people Gaara had to face in his life, the Colourless Princess, Yukiko Nakamura, was one of the most challenging. He had to accept his love for her, then accept to let her go, having lost her, then she became an enemy and he had to fight her. He knew he had vowed to kill her for the sake of his people if she was ever to come back. Yet when she did, he took the risk to protect her, against Suna’s Council approval and she got her redemption, and later on, could protect her own people too. When they met, Gaara’s sand immediately reacted to Yukiko in a protective way, even before himself could consider tolerating her. Even if Gaara was unable to understand his feelings at first, to accept and understand his desire of protecting her, Karura could feel it. She decided, when they met and Yukiko got attacked, to protect Yuki like she would protect her son. Because she felt she would be someone who could help to guide her son to the right path and give him the love she cannot. Yukiko has a very maternal side to her (see how she takes care of her sisters). She has this strong benevolence that helped Gaara changing and echoed Naruto’s speech. Yukiko never had any bad judgment towards Gaara, she would only state facts and remind him his actions have consequences & can affect other people. She never really rejected him even when he hurt her, she just took some distance after one of their fights to make him think of his actions. Karura knew what feelings he had for her, and she tried several times to establish a connexion with Yukiko, knowing her bond with the dead there may be a way to send a message. But it failed as Yukiko, too young and too lost in her life at this point was unable to open herself. However the mother’s approval can manifest through these hands of sand protecting both her son and the one he loves.
