Since you said under 30oz, then I vote Kahr K9. If you had said under 20, then P9 would be the ticket, but the P9 (had one) has more recoil than even a Kahr MK9 (have one), which is a couple ounces lighter than the K9.
The Kahr grip is under an inch wide, short enough trigger reach for even the smallest of adult female hands, holds 7+1 rounds of the required 9mm, is single stacked, VERY accurate, SUPER reliable, and due to it's 25oz weight, tames the recoil QUITE well. There is a "Lady Kahr" option with an easier to operate slide and slightly lighter trigger pull.
The 3913 "LadySmith" is another one that fits your requirements, but having rented one twice while trying to find the BEST pistol for my wife, it just didn't feel (to her) as comfortable as the Kahrs. The grip surface is wider, and the grips are plastic. I think the Kahr's K series super comfy rubber grip is part of what makes it so pleasant to hold on to.
Taurus Millinium... :barf: trigger. Double column mag, about the same width as a Glock 26, only small hands can get all fingers on the grip.
FireStars - Had one in 9mm, and although I ABSOLUTELY loved it for it's size, it did stovepipe every few magazines, and if it does weigh less than 30oz, it isn't by much. The Kahr is lighter.