My girlfriend texted me to say good morning, but I didn't reply to her for an hour. She was very angry. What should I say to her?

Explain the reason carefully. Promise me it won't happen again. Then you can say, watch a movie tonight and buy her favorite food. You can also send a few more text messages to make her happy. Tell a joke or something. You have to coax yourself anyway. Women in love have low IQs. Her performance shows that she cares about you and loves you. No big deal. Let's go