Summon Witness (court of additional district and session judge Kolkata

My 70-year-old mother had rented out-house (small low roof two rooms outside the main house) to two young people in Kalyani, Nadia , West Bengal.(small town near Kolkata) These two people turned out to be thieves/criminals who were hiding there and police came and arrested them from my mother's place. My mother used to stay alone at that time. She also suffer from diabetes and undergone several surgeries. She allowed them to stay without any documents so the police warned her at that time. Now ,she got a warrant from the court (summons to witness) and the court asked her to appear on 15th March, 10 am. It is not possible for her to travel to kolkata and stay in the court for whole day as she is not in good health. Moreover those two guys just stayed in the out-house and she did not know any information about them and cannot help in this case anyway. They committed offence in 394/397/411 as per the warrant. Please guide me on what to do.