If it fits you, carries your load and does not make you ache at the end of a long hiking day..then yes, why not use a "women's pack" ?
I put it in quotes because it is still nylon, straps and a hip belt at the end of the day.
Oddly enough (?), you don't see too many women asking if they can use a men's pack.
Women tend to be more intelligent than most men and just use a pack that works. :)
(Though, admittedly, Mrs Mags does like a pack they is not festooned with duct tape, nor wear hiking clothes from the surplus store and somehow manages to look "fresh as a daisy" after three days of backpacking where I look like insta-hiker-trash with little to no effort the moment I step on the trail)