Actually it doesn't. The very fact that she's next to you in a race means she's at least 7% better.
Only yesterday I had this discussion with possibly the most consistent top level women distance runner in Britain; three times National XC champion & Olympian Andrea Whitcombe.
I related how on our first run together (I was enlisted as a minder by the way) she put me on my face and stood over my gasping form on the ground asking without even the merest hint of fatigue, "Are you all right"?
I thought back to how I'd been warned about this probable outcome. I hadn't believed it possible. Wrong!
An indication of my own personal confidence levels is that I have no problem at all being beaten by a women in any race. Whoever it is must be brilliant to manage it. And I can live with that, easy.
I seen slower runners barged all over the place at the start of races. They claimed they had rights, which they did. However under 'battle' conditions 'rights' are suspended in the light of 'might'.
Actually at the start of an edition of the Gosport HM, the starter told unrealistic runners to get back to their estimated finishing time pens since when the 'gun goes, you will be knocked about by faster runners, you won't like it, and it'll be all your own fault. So be warned'.