Question on Divorce (Fatwa required)

Asalam o Alikum, Dear All, If a girl sign on divorce papers without her consent under the pressure of her parents ( her life fear), whether it would be effected. Point to be noted is that the girl consider those papers just as a piece of paper and nothing more and contesting the case in court. But what is the reality of this islamically. Also the girl was given right to divorce husband in Nikhanama. Now the lawyer claiming that islamically that divorce is effective whether the girl accepted it or not but she signed it thats it. Would appreciate if some one can provide some supportive document also that can be used i.e Fatwa, law etc. Many Thanks,