In marriage, that care comes from her husband. Before marriage, she often can find that protection from her father.
Scripture indicates women are weaker in that way.
Egypt was compared to women because it was a vulnerable and unprotected nation. God was prophesying that when He moved against Babylon, its weakness would be like that of a woman's. Babylon's army was compared to women because it was afraid, without strength, and defenseless. The inhabitants of Ninevah were said to be like women because they were defenseless and vulnerable to the enemy's attack. It's not a negative thing for a woman to be a weaker vessel.