Question

she plays football on sunday.(change into negative)
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Answer 1

Answer:

She doesn't play football on Sunday.

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Answer 2

Here is the correct answer:

She doesn't play football on Sundays.

Explanation

In Simple Present Tense, we use base form of a verb. When the subject is singular, we add -s/es with the base form of the verb (V1+s/es).

In questions, negatives, and negative questions we use auxiliary do/does+v1 with ‘not’ + V1

We use the present simple for  

•states, things staying the same, facts and things that are true for a long time: We live quite near

• repeated actions: We come here every week.