I'm looking specifically for warriors that could engage in single combat against a male, since the character I'm writing is one of three people traveling together in a world where males are the dominant warriors.
I can't tell whether you are misunderstanding how statistics work, or shifting the goalposts wildly.
Even if we grant without any argument
all of the usual claims people make about why men are on-average better at combat, and ignore
all of the counterarguments...
The vast majority of people are solidly within the overlap of the ranges. If you think of the tallest, fastest, and strongest people you have ever met, there is almost certainly (>99%) a woman out there who is taller than the tallest man you've met, or faster than the fastest man you've met, or stronger than the strongest man you've ever met.
Furthermore, training and skill dominate in most combat. Sure, if you're fighting someone who weighs half what you do, has muscles atrophied from spending months in a coma, and has severe asthma, you have a pretty good chance even if they're more skilled than you are. But for more realistic comparisons? Skill trumps the usual range of variance you see between people in terms of height, reach, strength, or whatever else. Solidly.
So:
1. A completely average strength/height woman with years of training will utterly dominate men with under a year of training in combat.
2. An above-average woman will be stronger and faster than average men.
If you select the most effective combatants from a population which at least
allows women to be trained combatants, you might well find that the
majority of the best are male... But it is not at all reasonable to assume that they will
all be male. That is not how population statistics work! And it really comes across as though you are consistently comparing merely-average women to a highly-selective sample of above-average men, and that's not actually particularly interesting.
You might argue that a really skilled woman is only going to be able to reliably beat about 95% of men, and 98% of other women. So what? >90% is still pretty solid, and no one wins every fight every time; skill and natural talent only get you so far, luck is always a factor, and that is
why people tend to travel with friends.
In short, if you want to write a woman who's a good fighter, do it, and it will be significantly
more realistic than your current stance, which is biased heavily towards insisting that only things which are commonplace can happen.