Not at all actually, that sounds great! What I find to be potentially fanficy is her explicitly being the better fighter of the two. Not that I actually have any issue with her being the better fighter either, it's just that there really isn't a good way to make that explicit without it coming across fanficy. Does Kaladin see her fighting and think to himself "She's even better than me!"? Or do they spar or something with her winning handily? Cause those are both pretty much hallmark fanfic moments, particularly in fanfics with author self-inserts (I won't use the dreaded M-word, but I expect most people have seen this sort of thing.)