Need divorce from nri husband

This is for my sister. We are residing in India and her husband in Bahrain with his family.She was in Behrain for 2 years.It has been 2 years after their marriage.We came to know that he has s*xual problems.We doubt it is impotency.My sister never had s*xual intercourse with him till date. First we thought it will be alright as time passes and once they understand each other,but we came to know he has s*xual problem as they were sent to counseling.Though we have asked his parents to take them to counseling long before,they never listened,Only after our serious compulsion they took him to couselling. Between these problems my sister had to experience serious torture from his family.her Father in law s*xually torture her by asking what they did last night.Not only that he will try to cuddle and kiss her. When counselor refd a urologist. They consulted the doctor without taking my sister with him. As they found the mistake is in their part they began to avoid her. Nobody talked to her for last few months.She was a teacher in a School in behrain.The account she had was a joint account,but they posessed her card.They also transfered about 5lakh ruppees from her without her knowledge. We are totally fed up by now. So we have decided to move for divorce. 1) If we are moving legally without mutual consent,how long will it take? 2)What if they didnt attend the court and how long they can prolong the case like that? 3)What can we do to avoid long prolongings? 4)If they prove he is not impotent,what can we do for getting divorce?