Darla Holloway, a 4-year-old suffering from acute lymphoblastic leukemia, delivered a stirring rendition of “God Bless America” during the seventh-inning stretch Tuesday night at Fenway Park.

Darla, who is currently undergoing chemotherapy treatments, said on WEEI’s Mut & Merloni that she’s been practicing every day for her big night, which also included being part of the Jimmy Fund chorus that sang the National Anthem.

Check out Darla’s impressive performance in the video above.