Yeah I thought the same when I saw that. ERode described the stat to represent all strength, dexterity, and fortitude, so the unnaturally high rank could merely denote her affinity for darting around due to her smaller and more nimble body. Who knows, maybe she took gymnastics or acrobatics or merely has a knack for slipping past the enemy's grasp.
Grimgar is still relatively realistic after all, so it'd be odd to see someone of small stature exhibit raw power rivalling that of warriors much bigger than her. Unless of course, she's secretly a trained martial artist who has kept her body in peak physical condition of course. We don't know much abutter her as of yet ^^