Sarai is taking revenge. She is full of hatred towards her maidservant. She wants her to go away, and by doing so, she was also taking revenge on her husband, Abram. If Hagar would leave, then there would be no maidservant, no child, and no heir. Who would then inherit all the property?
6 But Abram said to Sarai, “Behold, your servant is in your power; do to her as you please.” Then Sarai dealt harshly with her, and she fled from her.