NEW : `` I ca n't imagine a mother doing this to a child , '' Sandra aunt says . The day Sandra was last reported seen , she returned home from school , kissed her mother and left to play with a friend who lives nearby . NEW : Suspect 's daughter was Melissa Huckaby 's friend , playmate . Sandra was arrested on charges of kidnapping and murder , police say . Body of Sandra , Monday , was found 8 stuffed in a suitcase submerged in a pond .
NEW : `` I ca n't imagine a mother doing this to a child , '' Sandra aunt says . NEW : Suspect 's daughter was Melissa Huckaby 's friend , playmate . Sandra was arrested on charges of kidnapping and murder , police say . Body of Sandra , Monday , was found 8 stuffed in a suitcase submerged in a pond .