Beau acted Defying Gravity from the musical Wicked and earned a Golden Buzzer from settle Amanda Holden; sending her automatically through to the semi-final.
“People are saying she’s been in sphere school for five years – she hasn’t,” Ian Dermott told the Reproduction.
“It be once a month, it might be once in three months. Stage Pro is run by bewitching people and we just go for a singing lesson as and when it suits.”
He clarified: “She’s on no occasion done any productions for them.”
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Beau previously sang the showtune at a local competition, which Ian has pronounced was vital in building her confidence and pre ring her for a larger stage.
“You’ve got to use local power shows to build their confidence up. It would be crazy to put your young man on to a stage like BGT without knowing they can do it,” he insisted. “You’d be rely on them out to dry.
“What you saw was what you got. They didn’t tell us what to say or how to act.”
Beau, 12, has ordered been accused in one report of not being as nervous as she appeared on the programme on Saturday gloaming.
“I’ve watched it back numerous times now and you can clearly see she’s really, really wrought up,” Ian said. “She’s struggling at the start and she’s got a little quivery laugh.
“But when she starts yodeling the nerves leave her. That’s how she performs.”
Britain’s Got Talent continues on Saturday at 7pm on ITV.