Should Transgendered women be allowed to compete against biological female athletes

One of the Most controversial MMA fighters today is Fallon Fox, She is a transgendered Mix martial artist who competes against women.  I remember the olympics do allow transgendered women to compete against biological females as long as they have the body frame and estrogren level of a woman. Most Transgendered women who are allowed to compete as women, transitioned at a very young age. The ones who are allowed transitioned as little boys.

Fallon Fox lived as a man for a long time and even served the Military before she decided to become a woman. At the early stages of her career women can't beat her because she have the built and bone density of a man. She defeats women in few seconds because she use to have the strength advantage due to being an adult male before she transitioned. 

One of the women she defeated that she should have been informed that she is going to fight someone who is born as male.  There are female fighters who said she should not be fighting biological females.

Women cannot complain about her having strength advantage anymore though because she already lost to one woman. So it is proven that women can actually beat her.

So what is your opinion? Should they allow her to fight women?