1. You have already completed 1 year of marriage and had come to know about her qualification and ailment after your marriage.
2. You should have filed a petition before the Court or annulment of your marriage for obtaining your consent for the marriage by suppressing the vital fact within one year of your coming to know about the vital fact which was suppressed from you but now the time appears to have been elapsed.If you have come to know about her ailment recently, then you can file the petition praying for annulment of your marriage and in that case, you won't have to pay any maintenance or alimony.
3. For filing divorce case, there should be ground acceptable by the law like cruelty and since you stay abroad, it will be difficult for you to prove her act of cruelty on you for seeking the decree of divorce.
4. Her father's earning or owning of property has nothing to do in your claim for reduction of maintenance amount to be paid to your wife in case she asks for it. However, if she is highly qualified holding B.Tech degree and capable of earning for maintaining herself, she will not be considered as eligible to get any maintenance from her husband.