Divorce

Hello Sir. Need your view on a particular query. My sister is a married 5 years back under Indian Hndu Marriage Act. Her husband has been working in Switzerland. So she moved to switzerland under dependant VISA along with him after marriage. She studied there and then got a job with work permit in association with her dependent VISA. the boy recently told he wants to be separated and is asking her to move out and threatening her that if she does not consent for divorce he will not extend her dependent VISA and hence she will have to move back to India. My sister is not willing to move back to India, as she has made her career there. Even though she is not willing for divorce, looks like there is no option for her but to face this situation. He also told her that per Swiss law they will get divorce after 2 years anyway, if they don't live together. However, question is since they are married under India law, they shall file for divorce under India jurisdiction and Swiss courts do not have jurisdiction in this case. We are also thinking to file a case on mental harassment for threatening my sister and asking her to move out before separation.