Brennley grew up listening to country music and performing in school talent shows. Her signature move was throwing her pink cowgirl hat into the audience at shows. She recently was cast as Lily on the animated show "Sofia the First." For two years, starting at age three, she watched her mother go in and out of hospitals before she was diagnosed with Lyme carditis, which has no cure. Music helped Brennley cope with her mother's diagnosis. Her dad owns a hair salon where she spends her spare time when she's not gigging, doing voiceover work or homework!