What are some sponsoring organizations for female MBA candidates who are U.S. citizens?

Hi - I would highly recommend finding an employer that will reimburse your MBA expenses.  I did that several years ago and found the experience challenging but very rewarding.  You'd need to be prepared for potentially long days at work followed by school at night.  Adding in the homework and group projects you'd also need to dedicate most of your weekend.  I recommend trying to complete the MBA program as quickly as possible so you're immersed in the program and get into a routine.  It will be worth it and should take about 2 or 2 1/2 years to complete.  One additional tip - if you can attend the 'executive' MBA part-time program at some point (I did mine at Suffolk University) there are added benefits, like your books are considered part of tuition, which means your company will reimburse you for that too.   Don't be intimidated by 'executive' - it usually means you have work experience and are currently working.  Hope this helps!