Women and men alike have always been "allowed" to divorce for whatever reason they like. The first issue that arises if they divorce for other than an "approved" reason is whether they will thereafter be considered "exemplary" and allowed "privileges" in the congregation like pioneering or, if equipped with the appropriate appendage, serving as an elder or ministerial servant. That can be pretty arbitrary, depending on how well-liked one was before the divorce and whether the elders think the divorce was justified or not.
Aside from the stink-eye from various self-righteous busybodies, the biggest issue arises when the first of the parties wants to remarry. Then it gets complicated. If one of the former mates is an unbeliever (including those DA or DF), the one still in good standing only has to declare that they are scripturally free and that's pretty much it. If both are still JW's, one would have to provide "proof" of fornication or adultery before the congregation would sanction a remarriage. The level of proof required varies wildly, depending largely on the whims of the local elders.
It can get even more bizarre. If the guilty mate admits to adultery and is dealt with judicially (public or private reproof, or DF and later reinstated), they still are not considered scripturally free unless the "innocent" mate rejects them by formally saying they are not willing to forgive or by remarrying themselves. If the innocent mate still says they want to forgive and they do not agree to a divorce, the guilty party is not considered scripturally free. If they remarry anyway, it is considered an "adulterous marriage," and even if they are later reinstated they cannot be used in any exemplary capacity until the innocent mate either dies or remarries.