REI brand hiking pants come in Petite length. I love these that I got there last fall (these are the ones where the 2P is now a bit too large, though):

http://www.rei.com/product/861674/re...-womens-petite

Looks like they've changed the design a bit as last year's model had zip off's both at the shorts and capri length; this year's only the capri length. They are super comfy with just a little stretch, and the length is just right on me.