Miss Zhu could crush your skull . (Kinda Math below)

It takes roughly 520lbs of force to crush a human skull.

Now some sources say it actually takes 1200lbs of force I honestly doubt it and to keep my dream alive I chose to disregard them.

Now how strong is Miss Zhu? Especially in her lower body? I'd say pretty strong due to her having to carry all of that around, also she definitely workout, being in shape for hollow missions and all.

We have evidence of women crushing watermelons with their thighs, watermelon takes around 320lbs, again considering Miss Zhu's Ether aptitude...

Miss Zhu could easily do that to your skull.