repeating what others say is called Echolalia. it can be indicative of other problems. "Echolalia can be present in autism, Tourette syndrome, aphasia, Rubinstein-Taybi syndrome, developmental disability, schizophrenia and, occasionally, other forms of psychopathology." I am NOT saying this is the case, but is a warning flag. you may want to do a search on it and see if it describes her. i suspect at least a language processing problem.