She's weak? What?
I mean, if you look at her stats alone, then of fucking course she's weaker than the hero. Try looking at her potentials, genius. She's still level one while you're level 70 or so. She starts with sky-high numbers; HP 10 times than that of a normal villager, MP freaking 30 times bigger than of a normal villager, Attack 8 times stronger, Defense 7 times greater. Compare them to you, who supposed to be 70 levels above her; HP = 18 times less, MP = Practically the same, ATK = 16 times less, DEF = 13 times less.
Now, I don't know how you started, but I'm pretty sure your system has this thing called "level up bonus". Your stats elevates as does your level. By the time she reaches your level, you're overshadowed, man.
As the wise and greedy Weed said, don't start from zero.