Dang too small :( oh well I tried! I wear the women's MSR gear and have been very happy with it. I wear a size bigger than I do in regular clothes. Mostly b/c I want some room in my riding pants and not snug like I wear my jeans. The same way with the women's Fox gear. Might have to take a trip to the dealer and have her try on stuff.
Brands that make women's gear:
O'Neal
Fox
MSR
Answer
Troy Lee
Thor
Acerbis used to, you might be able to find some discounted surplus gear somewhere
Off-brands making their own gear:
Sick Racing
Elektra
Girlyz
You can google the above, I don't have their links handy. They have some interesting stuff if you want something a little out of the ordinary unless you're a brand-name-aholic.