The girl said she had not gotten along with her 37-year-old mother for a long time.
On Tuesday evening, the teenager came home and sat down right away to surf the internet, a police spokesman said.
The pair quarrelled after the mother forbade her daughter to use the computer.
After the argument was over, the girl went into the kitchen, took a knife and stabbed her mother several times, the girl told police.
Published 14 April 2010, 12:57 IST