Empower her with God’s word. Here are a couple of verses you can teach her about overcoming fear.
Psalm 56:3 When I am afraid, I will trust in [God].
2 Timothy 1:7 God has not given us the spirit of fear; but of power, and of love, and of a sound mind.
Psalm 4:8 I will lie down and sleep in peace, for you alone, O LORD, make me dwell in safety.
When I pray with my daughter, I personalize the scriptures. For example, I pray, "Help Grace lie down and sleep in peace, for you alone make her dwell in safety." Even at 3, my daughter calls on God when she is afraid.
Praying the peace of God, which transcends all understanding, will guard your daughter’s heart and mind. Philippians 4:7