Tamil dialogues of Shobana dubbed by

The Tamil dialogues of Shobana are clearly not dubbed by the same person who has dubbed for the rest of the movie. You can make this out if you listen closely. But in all the interviews of Bhagyalakshmi (the dubbing artist who gave voice to Shobana) takes credit for this. In the interviews when she is asked to perform these scenes she fails miserably.
But the interviewer and the audience simply applaud.
I remember from somewhere that Shobana herself dubbed the Tamil lines. But I'm not really sure.
Am I the only person to notice this? Has anybody heard anything about the dubbing of the Tamil dialogues?