Yes they would be within 5 points of each other, but she has power attack active as well. That causes her Bab to be -2 for her second hit, with furious focus not reducing it for the first one due to what the feet does. Furious Focus (http://www.d20pfsrd.com/feats/combat-feats/furious-focus-combat) so basically she is still within 5 Bab between main hand and offhand, its just that feet takes away the penalty to her offhand so its +2 higher then the other.