@Helleofabore has articulated it well.
It really doesn't matter if one amazing girl is amazing. We have long term studies showing the difference in athletic ability between males and females... they are called the World Records.
And while puberty plays a big part in male strength and speed.. it is not the only factor.
In fact, physiology itself is not the only factor. Social conditioning including role models, unconscious bias in behaviour towards children, clothing .. and many many more.
Broadly our society has segregated boys and girls for competitive sport for a number of reasons... there is an argument that the very best performing females do better in a mixed or male dominated environment but there is also plenty of evidence that a significant majority of women benefit from female only spaces ... this was the focus of the efforts of many organisations who had aims to increase the participation of females in sport... until carving out spaces for females only, became challenging, people challenged the gendered language, the basis for the segregation and the definition of words.. so people slunk away, feeling unsupported and afriad of conflict. We need to reclaim this.
We know why we segregate boys and girls... it's not all about who is fastest (but that is a big part of it..) ... some of the reasons may not feel ideal or great to express out loud... but we know why there are fewer girls kicking footballs in the playground.. thank goodness that is changing.. the answer is not to put everyone together and say get on with it.. it is to put the girls in their own space, change their shoes and their skirts, show them how much fun football is, how good it feels in their bodies to move them, to use them, to feel powerful .. and then show the boys.. but even when there are AMAZING STRONG AND FEARLESS girls and women in the boys teams.. they have to be better, stronger and put up with a lot of negativity just to be allowed to show up.. it breaks many women. We deserve the right to do all of that, but be mediocre, be supported and enjoy ourselves.
If we lined up every year group and asked them to run across the playground... the bell curve of finishing times for girls and boys would have a very different mean... but across the country, the profile of that gragh would be similar...
I am boring myself now... but yeah.. not all peer reviewed studies reflect real world situations.