Despite being loyal only to Shin, like what is expected of a person who calls herself his servant, she isn’t absolutely/blindly loyal to him or inclined to feel positive feelings for him, simply because he is her master. After the “Dusk of the Majesty”, she became a real person with real feelings. Schnee has her preferences, and she can’t stand a dangerous, unstable, maniac who kills blindly. Shin had a dark time in the death game and she tries to shoulder his burden because she doesn’t want Shin to turn bad again. She would never be in love with an evil Shin, just because he is her master. She loves the true, good natured Shin.