How about" lucru" instead of "munca"?
i also think that synonym should be accepted, i.e. "(tu) faci lucrul ei mâine"
I don't understand why 'ei' is the correct form here.
To me, "...her work..." indicates posession ~ and the pronoun ought to be 'sa'.
if i remember well you can express possession for the third person either with the possessive adjective or with the genitive form of the personal pronoun. so the two would be right.
Difference between munca and slujba?