I mean you are, but you're also not really taking her progress at face value. You know how fast and powerful Peng is.

If even as impulsive as she can be, she still did well enough under Master Subodhi to help come up with a plan that worked almost perfectly. [Minus the whole Azure nearly destroying everything after monkey form MK beat him to the breaking point.]

Bening a good teacher is also paying attention to how they're growing when you're not around.