Your feet are very narrow, so when you buy boots that fit lengthwise, they're still too wide, right? For starters, what you could do is get a better picture of your precise foot size and shape. Do you buy shoes locally in your town? Can someone there spend a few minutes with you and carefully measure your feet with a Brannock device, the thing that measures length and width? Still, I'd start by ordering boots a full size above what the Brannock device shows you need.
I'd also take care to ensure the shoes are made on a woman's last. Lots of women's hiking and climbing boots are simply men's shoes downsized a little. The Lady Makalu ($245; www.sportiva.com) is one such boot, so in theory it should be a good choice for you. La Sportiva's Glacier, a great all-around boot ($225), is built on a men's last. By all means, call the manufacturer (in La Sportiva's case, 303-443-8710) and talk your problem over. Try the Montrail Moraine ($235) as well; it is built on a woman's last, plus Montrail is known for making boots that fit a very wide cross-section of the boot-wearing population.