She has been sensible since childhood, helping her mom with housework.
Tips
usage
懂事 is mostly used to praise children or young people for being mature and considerate beyond their years. It can also be used for adults who are thoughtful.
mistakes
Don't confuse 懂事 (dǒngshì, sensible/well-behaved) with 董事 (dǒngshì, company director) — same pronunciation, completely different meanings and characters.
