Tayla yesterday performed spine-chilling renditions of Ave Maria and Danny Boy while crew members adorned the stage with roses.
Her father, Dwayne, said Tayla was very driven and had a better work ethic than most adults.
"She does this weekly calendar where she plans her days out, all her after-school activities and music practice, and she does this without any help."
His daughter first started singing at age 4. She has since performed in front of 200,000 people at Christmas in the Park and has been invited to sing at a children's hospital in Canada next year.
"She likes the buzz," said Mr Alexander. "She's self-conscious, as all 12-year-olds are, but I think this has given her an identity and really helped these in-between years."
Her Facebook page, Tayla's Music, has nearly 6000 likes and she is in touch with fans from as far away as Canada, the United States and the United Kingdom.