1. So rather than humiliate themselves by throwing themselves endless at the feet of single brothers (who would just ignore them and marry the young 18 year old sister instead) they would boldly declare that they didn't want to get married again.
2. she has woken up somewhat to what a bunch of mysogynistic assh**es most JW men are,is she going to marry someone a lot younger than her? If not, why has this guy she is looking at been single for so long, or did he come from a relationship that did not work, if so what was the problem.?
3. She realizes that the sex with a JW is missionary and for the most part dull as dirt. Why bother with that for the rest of her life?
So, as noted by the above combined comments, JW women simply give up. They decide that being lifelong spinsters is better than being stuck in a dull, possibly abusive marriage. And, they are already in spiritual subjection in the KH. Why be in subjection at home?
JWs can get divorced. That is a legal issue between parties and the court of law. *Scriptural* divorce is what people refer to here. Scriptural divorce is what the bible references when it talks about people only divorcing for infidelity.
So, if two JWs divorced, neither could get remarried until one of them confessed to being unfaithful and then that one would get DFd allowing the other to be Scripturally divorced. The DFd one could get remarried anytime. Usually, when two divorced JWs start dating and/or one remarries, the moment the one remarries, it is a Scriptural Divorce.
As for marrying outside the faith, they can. However, they are treated like dirt for doing it. They aren't invited anywhere by JWs because of the Worldly spouse and are strongly encouraged to get that spouse to join. Watching it happen is painful.