“ Turn again, my daughters, go your way; for I am too old to have a husband. If I should say, I have hope, if I should even have a husband tonight, and should also bear sons, would you therefore wait till they were grown? Would you therefore refrain from having husbands? No, my daughters, for it grieves me much for your sakes, for the hand of YHWH is gone forth against me.”
Furthermore even if there had been a chance that she could produce children, and was able immediately to marry, would they really want to wait until any sons so born would grow up? By that time the women too would be almost beyond childbearing. No it was better for them that they left her and returned to their families and sought husbands in Moab. She assured them of the grief that she felt that YHWH had so dealt with her that she could offer them nothing, because His hand had ‘gone forth against her'. The whole move to Moab, although seeming a good idea at the time, was now seen as a disaster. YHWH had not been in it for good.