Their bodies were found at their residence here last night by her parents.
Police said she had got married in 2011. Her husband had come on one month leave recently here and gone back to Assam, where he is posted.
Last night her parents, who stay nearby, went to see their grandson but found the door locked and a foul smell coming from within. They broke open the door and found the charred bodies inside.
Police said they are investigating the reason for her taking the extreme step.