> you are really lucky she decides she wants a working guy
what do you mean by “lucky”? If you think, she should marry someone who does not work, then why “lucky”? If you don’t think so, you can just make it known that you are not planning to support them, and let her go from there.
There might be a problem of competition here: if “everybody” (in that community) marries at earlier age, then this girl will be at disadvantage. It may be that those who get professions, get married later? So, if she finishes BS by 21, maybe she’ll have her choice of MS and PhD candidates?