Teaching 3 year old letters

My 3 yo is amazing with numbers, shapes and colors. She is extremely verbal and communicates unusually well for her age. However, she is having a hard time with her letters. 🥺 They did an assessment at her new preschool and she only recognized 8 of 26 letters. My son knew all of his letters by 3. I know children develop differently but what are some ways I can help my daughter learn her letters? Flash cards? YouTube videos or apps? She isn’t great with a crayon/pen/marker so tracing is difficult. Thanks in advance mamas!