All of her options result in the same thing
1) She waits and finds a "brother" to marry. It isn't going to happen-and if it does, it won't be a love match-she'll be stuck in a lousy relationship, in which she is relegated to the "helper" and is treated as a second (or third) class citizen by her life partner.
2) She remains single-holding out for Brother Right. As a female, she is of no use to the congregation, and as a single female she is a liability as a friend to the married sisters (she might try to steal their husbands), and competition for the unmarried sisters. Her frienships (if she has any) will be unauthentic and colored by jealousy and politics.
3) She dates and marries a worldly guy. She won't be treated too much differently than if she stayed single as in option number 1. She may be reproved, or even disfellowshipped. Once "reinstated" she will still be treated as an outcast. However, on the plus side, she will have a love match, and a rocking husband that treats her better than any "brother" would. And she has access to the "world" whenever she wants escape from the religion.
As a woman, unless her dream is to be a pioneer, the practical result of her marrying a worldly guy is no different than if she stayed single, and not that much different than if she married another JW, but the benefits would far outweigh any slight change to her "status" (which sounds like it isn't too good anyway).
I'm glad I realized the irony of this when I was in my teens. I saw the process in action with a couple of gals in their late twenties--both went outside to get spouses (and one the daughter of an elder, too). And these were stunningly beautiful women, too. They have great marriages and were never treated that well in the congregation anyway, since they were hot, single women.
Since she doesn't have a Y chromosome, it really doesn't matter what she does-in the practical sense.
Shoshana