Blessed above women shall Jael - be - She shall be highly celebrated as a most heroic woman; all the Israelitish women shall glory in her. I do not understand these words as expressive of the Divine approbation towards Jael. See the observations at the end of Judges 4:24; (note). The word bless, both in Hebrew and Greek, often signifies to praise, to speak well of, to celebrate. This is most probably its sense here.
The blessing here pronounced is in strong contrast with the curse of Meroz. Deborah speaks of Jael‘s deed by the light of her own age, which did not make manifest the evil of guile and bloodshed; the light in ours does.