This should have been in the which bike forum, but it'll be moved no doubt ;)
Not sure of the size of the XL, but a small range (in my mind for someone around 5'-5'4") is the Suzuki DRZ125, Kawasaki KLX125 (same bike, different colours), Yamaha TTR125. They're all around the same height & weight. The TTR has been around a year or two longer than the others. A new bike out is the Honda CRF150/230, which are both smallish bikes.
Your best bet is to go to a Honda/Kawasaki/Suzuki/Yamaha shop & look around. Those might be a bit small (height, weight helps us try to help you) but can be got in both small & big wheel versions (except the Hondas).
The bigger the bike, the better it'll be for logging roads, so get as big a bike as you feel comfortable on. Another one to look at is the Gas Gas Pampera, but it is two-stroke (mild-mannered, but still need to mix oil & gas).
Hope that helps some