There's no definitive, publicly accessible database that keeps a constantly updated count of women's colleges in Pakistan. The number fluctuates as new colleges open and others may close or change their status. Furthermore, the definition of a "women's college" can be nuanced; some institutions may be exclusively for women, while others may be primarily women's colleges but accept a small number of male students.
To get an accurate number, you would need to conduct extensive research across all provinces and regions of Pakistan, contacting educational boards and individual institutions.