It's stereotypical but G&G offer a 'ladies' option called the 'Femme Fatale'
http://airsoftzone.co.uk/ff16-m4-carbine-femme-fatale-pink-aeg-gg
Depends on your budget though...
£80-£130 - Some sort of G&G I'd say...
£130-£250 - ASG have just brought out a "devil" series that looks good value
£250+: Krytac CRB - no comparison (apart from the krytac SPR) unless you're going way over £400.
Just my opinion anyway
---EDIT:
Don't forget about accessories like mags, grips etc - maybe consider your own collection and think about compatibility with what you already have....
Unfortunately imho G&G seems to have stopped the pink short Raider:
http://www.evike.com/product_info.php?manufacturers_id=&products_id=35947
this Raider is better than the 16 FF which is carbine & battery up front
(well it is on my one - ergh I got it cheap for missus I'm saying)
maybe should use the FF16 lower receiver silhouette lady than the sexy kitted up lass - depending on what girlies may prefer
(or the other "love G&G" logo I guess if you bat for other side)
They have seemed to kept the blowback models - the guns not the girls sounding like pron stars - ha blowback model get it - I'll get me coat/raincoat
but these might be old stock and maybe the black/pink Black Rose models - again not sure but might be blowback
But tbh, that is if the ladies actually want a pinky or touch of pinky gun or think sod that, I want a gun like that all the guys use
Weight though - yes a 416 metal mofo comes in at nigh on 4kg compare to polymer guns @ just over 2 to 2.5kg
so by end of the day you may feel the difference if you are a bit of a girl's blouse like moi
End of the day - to be fair, I would let HER decide or at least have some input in it as it could be her gun
Well - if you know what is good for you - and don't take her word for word if she says " FINE "
when a woman says fine - it means anything but that - usually you better not or just you bloody wait
(ignore most of this crap, especially any relationship advice - the last bit Mrs Duck told me to write so I follow orders - her orders)