She (not/to have) dinner with her family two hours ago.

She did not have dinner with her family two hours ago.

The sentence is in Past Indefinite. Past Indefinite is used for a past action. There are two kinds of verbs in English. They are regular verbs and irregular verbs. Regular verbs form their Past Indefinite with the help of suffix ed. To wash washed. Irregular verbs take their second form for Past Indefinite. To drink drank. The auxiliary verb of Past Indefinite is to do, we use the second form of this verb to make negative and interrogative.

She had dinner yesterday.

Did she have dinner yesterday?

She didnt have dinner yesterday.