The court also imposed a fine of Rs 2,500 each on the duo Rohima Khatoun (60) and Mariam (30).
The sentence was awarded by Additional Sessions Judge Priyadarshan Sharma, who pronounced the two guilty on charges of abduction and child-trafficking, among others.
According to prosecution, Khatoun and Mariam abducted a 15-year-old girl in January this year from MIG area here and later tried to take her to Mumbai by Avantika Express.
When the train left Indore, the teenager narrated her ordeal to fellow passengers, who alerted the Government Railway Police (GRP).