Morey told the show's official website that Sonya entered Callum's life, not to get him back, but to see if he was okay. However, she then fell in love with Toadie. When she was asked how Callum does not remember his mother, Morey explained that Sonya had fallen in with a bad crowd and had become addicted to alcohol and drugs, when she had Callum.
Morey
Sonya