Singer Louise Hall, 18, fell unconscious after suffering a severe asthma fit.
She was rushed to hospital after passing out for at least five minutes following a bust-up with bandmates.
A show source last night told Daily Star Sunday: “It was horrible to watch and everyone was terrified the worst had happened.
“The asthma attack appeared to come out of nowhere and the next thing you knew she was lying unconscious.
“After she had been out for five minutes people really started to freak out.”
The horrific incident threw the ITV show into chaos. Welfare staff worried the pressure of competing had killed her.