Most, if not all, high positions in the Vatican are led by those who are ordained. Women can not be ordained, therefore are unable to be placed in those positions.
As a woman I have no issue with this. If we break it down a bit all Catholic parishes & dioceses are the same way, led by ordained men. In my parish we have four female paid employees, including me, but the bosses are the priests. The work I do for our parish is important and necessary. I am fortunate to be able to work for a low salary without impacting my way of life. I love my job and pray I can impact young lives in such a way they stay in the church once they become adults.
As far as strong women being in high positions, we should be grateful we have strong women who are ready & able to do the work without needing a title or high position.