Nobody would let her. Each time she went to the front, some male would come around and get in front.
Edit Add: Different than the post above this was the Tue/Thur night World Championship - so everyone was very serious cyclist.
https://www.youtube.com/results?sear...te+Market+ride

This may not be due to being a female. I've seen this with super star celebs too, and they just tool along mid/back and don't get near the front. If they do, someone is trying to beat them. I remember my son riding with Sagan and I asked him if he could beat him up the hill (Swami's ride, San Diego ~ 2012) and he said, sure, he hangs at the back and talks to the girls.