All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
If a woman gets married, her husband has more right over her than her parents, and he becomes her provider and sustainer and she is obliged to obey him. Rather, her obedience to him comes in priority over her obedience to her parents and we have already clarified this in Fatwa 119697.
Hence, your father-in-law has no right to prevent your wife from coming to reside with you. A wife is obliged to reside where her husband resides unless she has a sound reason for refusing, otherwise she is considered a disobedient wife. To know the Sharee’ah steps you may follow in order to discipline a disobedient wife, please refer to Fatwa 85402.
As regards the conditions that her father put in order to bring her back to you, then you are not religiously obliged to accept them. Rather, you should follow the steps of disciplining a disobedient wife that are mentioned in the above-referred Fatwa. Then if your wife takes heed, this is what is required, but if she insists on her stand, you should appoint some rational men from your family and hers to talk to her father and her. Then if reconciliation happens, praise be to Allaah, otherwise there is no good for you in keeping such a wife.
Moreover, you are permitted not to divorce her until she ransoms herself from you. When interpreting the verse in which Allaah Says (what means): {And do not make difficulties for them in order to take [back] part of what you gave them unless they commit a clear immorality [i.e. adultery].}[Quran 4:19], At-Tabari said: “In regard to making difficulties so that the wife ransoms herself from her husband with what he had given her, or with part of it, then this is a right of her husband… the meaning of the verse is: It is not permissible for you, O believers, to deny them their rights…unless they commit a clear immorality [adultery] or use bad language for you, and they deny you your rights over them, then in this case, it is permissible for you to deny them their rights so that you take back some of the dowry that you had given to them if they ransom themselves with it.”
Nonetheless, it is strange that you say that your wife got you to stop your work, prevented you to take benefits for six months, and she did not let you see your friends. All this means that she considers herself as your protector and provider and this is contrary to the teaching of the Quran. What is even stranger is that you obeyed her orders and submitted yourself to her. There is no doubt that this is actually humiliating to you and this makes your wife more arrogant and aggressive toward you.
Allaah Knows best.