Indigo Airlines — flight missing 6e579 on march 25

My daughter could not reach the destination due to prepone of flight followed by missing the same on 25 march vns to mumbai 6e 579. Pnr lkys9k she reached vns airport at 2:00pm. The flight was scheduled at 2:40 pm but preponed and take off at 2:25pm. She had handbaggages only but indigo personnel refuses to board her besides it was little rush there. Pl look into the matter and reply what refund could be done in due course