I told her there would be no way a woman could win a stage nor help any teammates. However, she did ask me a good followup. She asked, what if a team would just put a woman in with the only goal of her finishing each stage.
Which was an interesting question, what if one of the wild card teams with no shot of winning GC or even a stage would put a woman on the team. The woman would have only one goal, to finish the stage within the time limit of being cut off without helping her team mates at all. In other words, ride the end of the peloton each race and ride with the slow sprinters up the mountains. I know she would have to time trial within a certain cut off point also and I would expect her to get dropped at the end of the sprinter stages when they pick up the pace.
I know there isn't anything close to a 21 day women's racing tour, but I am just curious if a wild card would put a woman on just to get her jersey and name all over the television and media, would she finish the tour?