Предложение должно звучать так She does not do her homework now.
She is not doing her homework now .
Тут возможно два варианта.
She is not doing her homework now.
She isn't doing her homework now.
Предложение должно звучать так She does not do her homework now.
She is not doing her homework now .
Тут возможно два варианта.
She is not doing her homework now.
She isn't doing her homework now.