The top 3 "short person friendly" XC bikes I have found:

Yeti ASR (comes in XXS, and is what I ride)
Titus Racer X (also comes in XXS and I believe can be test ridden from Competitive cyclist for a fee)
Giant (Cypher or the women's version of the Anthem)

Edited to add: I'm 4'11" and all of these fit me well (test ridden them all) with the Giant being the closest call to not fitting but still much better than most, so they should be plenty small for you.