VIDEO : Judy Garland's Daughter Lorna Luft Collapses

Singer Lorna Luft has collapsed backstage after a concert in London.
She was rushed to the hospital where she reportedly underwent tests.
Luft is the daughter of late actress Judy Garland.
Before Luft collapsed, she was forgetting lyrics and a monologue.
Luft has been in remission from breast cancer, which she has been battling for six years.