Byrnes had her first credit at the age of 5. She has since had featured appearances in The Bold and the Beautiful, The Young and the Restless, How I Met Your Mother, Dirty Sexy Money, Winx Club: Enchantrix, Desperate Housewives, The Legend of Korra, Sofia the First and Spirit Riding Free.
- Appeared with Alyson Stoner in The Legend of Korra
- Appeared with Madison Davenport in Amish Grace
- Appeared with Evan Jones and John Rubinstein in Healing Hands