Actually it is not that hard, first of all both women and men have the same rights. But of course I am not saying that an elder can not abuse his power and give himself more rights. It is not like, the women have less rights as to filing for divorce.
With that said, both sexes can file for a divorce at any time. The only difference is, are they both allowed to remarry "in the truth"? There is this so called "scriptural" divorce. If one party commits adultery then both are allowed to remarry "in the truth".
Even if you one does not have "scriptural" divorce, he can still remarry someone (in the truth or not) you just have to face the repercussions.
I know a pioneer sister who is still unmarried in her late thirties. She met a brother who is not free to remarry in the truth. So whats the loophole here? They will both get married with the consequences of getting disfellowshipped for awhile, until they can get reinstated.