The more attuned a prophet is to the affairs of this world, the greater his or her degree of prophecy. Since Abraham was somewhat detached from worldly matters, he could not perceive Ishmael’s true negativity. Sarah, in contrast, was more involved in worldly matters, so she readily was able to perceive Ishmael’s evil. Her prophetic vision was therefore superior to Abraham’s.
Furthermore, we are taught that in the Messianic Era, the feminine aspect of creation will rise above the masculine. Abraham’s and Sarah’s spiritual refinement was so lofty that it enabled them to experience a foretaste of the Messianic Era. For this reason, too, Sarah’s prophetic vision was superior to Abraham’s.
Nowadays, as we approach the Messianic Era, all of us can welcome the flowering of feminine power in the world, acknowledging that women’s more intense experience of physical life grants them a higher level of spiritual insight than that given to men.1
"in the Messianic Era, the feminine aspect of creation will rise above the masculine" - Hashem embodies both attributes, as we know.
We are commanded to love Him in the Shema, but it seems a little difficult to love a great power. It is much easier to love one who raises those who are bowed down, opens His hands and provides for all the living with favour, one who is gracious and merciful, a parent and a spouse, isn't it?
These are all female attributes, and I would argue that we are to develop and express them today, to bring about the Messianic Era. What's missing from the world is love and unity.