Hanifa Zaara told the police in a letter that her father had "cheated" her and should therefore be arrested. She said that she was "ashamed" to defecate outside.
Many Indians do not have access to toilets and nearly 500 million defecate in the open, according to Unicef.
Even where toilets have been built, many do not use them.
Hanifa who lives with her parents in Ambur, a town in the southern state of Tamil Nadu, has never had a toilet in her house.