Gopika unwilling to dub

Gopika has so far completed nearly 20 films in South. Making her debut with Autograph, she has become a favourite among the producers and directors. She too hasn`t failed them. She has done everything possible to retain her place in South. The actress has spoken in her own voice after Autograph. But in her own woods, Gopika refuses to do so. She has more than twelve films to her name in Malluwood. In all these films Gopika has spoken in the voice of some other person. What is the reason behind Gopika's denial to speak in her mother tongue?