Question on Ritchey Outback Fit...

[hundredwaters]

I am looking to buy a Steel Ritchey Outback Steel Breakaway for my girlfriend so that we can travel and am a little confused on fit. She is 5'5" and not a big cyclist, so probably doesnt like an aggressive position. She found my small 1st Gen Outback a little stretched out with a 90 mm stem (Reach 385/stack 531). It looks like she would be best on a Xsmall which has an effective Top Tube of 526 mm (Reach 373/stack 532), but I have a hard time believing she fits the table of "XSmall" and I know this bike is supposed to be run with a shorter stem. Would I be better getting a small with an ETT of 540 mm (Reach 378/Stack 548) and run a short stem? Overall, both have a pretty long wheelbase of more than 1040.

We will be running 650B tires and doing much more trails and fire roads than road

Any thoughts...?