Amber is emotionally attached to the dragon guardians for different reasons (not the new ones as she doesn't know them. I mean like Ryumi and all the main bois)
Obviously she's attached to Ryumi because she is her idol and mother figure. But Amber is drawn to Shizen, not because of his kindness (which he doesn't really have) but the scar on his face. The only memory Amber has of her father is the scar that ran down his face to his chest. She can't remember anything else about him and Rhinestone refused to tell her daughters about their father. When she first saw Shizen, she even thought he WAS her father before realizing that it didn't really make sense. But she still holds onto Shaken in hopes that he will become somewhat of a father for her since she never really had one.