how competitive is vassar?

Well, I’ve no particular allegiance to US News methodology, though an introduction of the publication’s assessments would seem to represent a reasonable starting point in terms of the title of the thread.

If you have an interest, the BI standardized-scoring analysis has been updated:

http://www.businessinsider.com/the-50-smartest-colleges-in-america-2016-10

For an overview on gender imbalances in admissions, this WaPo article might be worth a read, should you not have seen it:

https://www.washingtonpost.com/news/grade-point/wp/2016/03/13/want-an-edge-in-college-admissions-see-the-schools-where-women-and-men-have-an-advantage/?utm_term=.ca655a9eb5b1