Joanna Reichert wrote an answer about Gregory Jade 50 Backpack - Women's - 2807-3417cu in on September 27, 2010
Hi! I'm buying this pack as soon as I have the funds and I too have discovered that every Medium women's pack out there (I just visited 3 stores yesterday for this purpose) sits WAAAY too high on me and just isn't comfortable. I measured at about 18.5, so after abandoning the Medium torso lengths I started focusing on short torso lengths.
I tried on the Gregory Jade 50 and it was the most comfortable thing I've had on my back, ever (and I have an new Osprey Aura 50 at home - must sell as it's a Medium). I need to lose some weight before our A.T. hike next spring, but currently my waist is 34-35 and my hips are easily 42", perhaps wider, but the Medium setting on the hipbelt felt just plain great. I know your torso is shorter but I would advise you to get to a store where you can try this, because I'm guessing you won't be disappointed.