Although the desolate woman has no husband she has more children than the one under the law. The law is the ruling husband of a woman in slavery. The promise frees desolate women to bear extreme fruit!- Teresa

Galatians 4;22-26 (ESV)

21 Tell me, you who desire to be under the law, do you not listen to the law? 22 For it is written that Abraham had two sons, one by a slave woman and one by a free woman. 23 But the son of the slave was born according to the flesh, while the son of the free woman was born through promise. 24 Now this may be interpreted allegorically: these women are two covenants. One is from Mount Sinai, bearing children for slavery; she is Hagar. 25 Now Hagar is Mount Sinai in Arabia;[f] she corresponds to the present Jerusalem, for she is in slavery with her children. 26 But the Jerusalem above is free, and she is our mother. 27 For it is written,

“Rejoice, O barren one who does not bear;
    break forth and cry aloud, you who are not in labor!

For the children of the desolate one will be more

    than those of the one who has a husband.”