Relying on the girl's statement and medical records, Justice VP Avahad held her father guilty of raping her.
The prosecution said the girl had in October 2015 complained of stomach pain to her mother, who thought it was due to the appendicitis surgery she had undergone in 2013.
When the mother took the girl for a sonography test, it came to notice she was pregnant.
Later the girl told her mother that her father raped her several times since September 2014.
The girl, who later gave birth to a child, is staying at an ashram.
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