About 1 in 4 PCT thru-hikers in 2009 were women.
On shorter hikes in more accessible locations about 1 in 3 backpackers is a woman.
On day hikes in very accessible locations as many as 1 in 2 is a woman.
On Backpackinglight.com and our Russian UL forum, the number of posts by women is under 10% (at our forum maybe 2%).
This suggests that there are tons of women interested in nature, walking, and fitness (at least as many as men), lots who enjoy hiking and camping, somewhat less who have the guts to do a thru-hike or something similar, and yet very few who will sit around online and ruminate over gear in public.
So chances are, Backpackinglight.com may not be your best place to find a "mountain woman." But certainly among local day-hiking clubs, walking groups, trail runners, fitness freaks, nature lovers, etc. one can find these women.
I found my mountain woman in a more unlikely way, when I wasn't really looking. Our first date was a hike up Pikes Peak, followed immediately by a thru-hike on the Colorado CDT which she decided to join me on just 2 days prior to the trip. She had never been overnight backpacking before. Now she is hooked, despite the discomforts.
You never know where you'll find them.
In Yosemite Nat'l Park I met a group of 4 late middle-aged women who go backpacking every year. They said, "our husbands don't like to hike." Go figure!