A hash tag has never done anyone any good ever.

If there were a 'solution', a formula for successful entrepreneurs we would have found it.  

This is not STEM gender issue from what I can see.  Engineering programs often have 50%+ women but they choose other fields like Industrial or Chemical.  That is a matter of choice not access.  

I suspect the founder gap is a lifestyle issue.  People pursue MBAs and found companies at about the same life stage. There are many MBA scholarship opportunities for women but programs struggle to attract anywhere near 50% women applicants.  Most successful founders come from industry not dorm rooms.  They spot an opportunity, take a leap and start a company.  These moves are big risks and it comes up against a lot of hard life choices like buying houses, kids, etc.   

Support from spouses would help.  Mentoring from leaders could help.  Gov. funded 'entrepreneurship training' , press releases.. this stuff is more bark than bite.