Oh yes, I did not intend to overlook the fact that Jael was a murderess! Which should be an OBVIOUS difference between her and the Blessed Mother from the beginning.
Jael’s actions are very duplicitous. In Deborah’s canticle, we see Jael being praised for her hospitality (the obedient work of an attendant in her position). It is in this sense ONLY that we should draw similarities between Jael and the Blessed Mother’s virtue. I did not mean to be vague here.
However, while the sacred author does not give us a value judgement on the murder of Sisera, it is clear from the context that he was an enemy of Israel. With this enemy status in mind, then, we can come to see how Jael’s murder of him, from an Old Testament perspective, is an erradication of evil. It is in this sense that one may see a parallel between Jael and the woman of Genesis. Jael “crushed his head” just as the offspring of the woman is prophesied as doing to the offspring of the evil one.
It is interesting to note, too, that at the very end of Deborah’s canticle that she prays to God: “May all your enemies perish, thus O Lord! but your friends be as the sun rising in its might!” (Judges 5:31). So, in the story of Jael we see how she may be an instrument of God’s justice. By her actions, an enemy of Israel perishes. Again, it harkens back to the instrumental role of the woman (Mary) in the coming of the Christ who by his death and rising has ensured the rising of the “friends” and “sons” of God!
This was much more food for thought than I think piscotikus’ brother may have intended, eh?