-2 STR - obviously.
+2 CHA - women are social creatures.
A bit simple and popamolish but good enough.
Even in well developed societies they live significantly longer than men, so probably a CON bonus as well.
Eh. I'm one of these "Maybe CON and STR should be one stat" annoying people.
I always found that a bit tricky. I mean, when you think "constitution" you immediately think of ruddy cheeks, a powerful frame - but that
is tied to strength, so it's kind of basically just strength all over again, or another angle on strength.
Rambling thoughts:-
On the other hand, the aspect of CON that's related to good health, healing recovery, metabolism, resistance to things like diseases and poison, that's something anyone could have a high stat in regardless of muscle mass (well, within limits). And particularly if you think of it as "biological innards in good working order" that's something women could specialize in to some extent. But any "resistance to physical damage" would have to also be tied to STR, it couldn't be just CON alone (unless you're talking about a monk type).
It's quite hard to find the right abstractions for these things, because they're all tied together to some extent. Strength partly depends on bone strength and density, therefore also CON in that sense (if you had "super-strength" without super bone density too, your bones would snap like twigs if you tried to do a super-strength thing) as well as fascia (again, all that integument would just go "sproing!" like a bust golf ball if you tried a super-strength trick without super-strong, super-elastic fascia too).
But fascia are also somewhat tied to organs and health (via things called "glial cells"), and that could speak to "ki/qi" powers (so as a damage stat alternative to strength, IOW a monk/internal martial artists should really be the melee equivalent to a "kineticist" in the PF system, using CON as main stat, and would also have the robust health and good metablism, poison resistance, etc., associated with CON).
But on the other, other hand, it
would actually make good sense to tie a secondary generalized melee "Power" stat (speed and muscle strength tied, therefore high "impulse") to decent levels of
both STR and CON. Even a martial artist using primarily "internal power/qi/ki" would have to have a
minimum strength (e.g. 13) as well as decent DEX (since ki/qi is also to do with clever leverage and positioning).
Come to think of it, minimum necessary thresholds around 13 would be a simpler way of doing what I proposed earlier re. dual stat contributions. e.g. you'd have to have a minimum 13 INT or WIS to be able to target appropriately for criticals, as well as at least 15 DEX, say. I think 3e and PF did play around with this idea to some extent. The "dead" odd numbers are really useful that way.
So then the choice would be clear between the concept of just sheer power (STR+CON) that bludgeons its way through everything, and is resistant to damage (more or less the idea of the Barbarian, but it should also apply to Fighters generally to some extent) and a more clever use of lesser power (crits) involving some DEX and some mental ability or intuitive insight.