Judy Garland's daughter Lorna Luft diagnosed with brain tumor after collapsing onstage

This March 2, 2014, file photo shows Lorna Luft at the Oscars in Los Angeles. Singer Luft, the daughter of Judy Garland, collapsed backstage after a concert in London, Friday, March 9, 2018, and was rushed to the hospital, where she was undergoing tests, a representative said. (AP)

Lorna Luft, the daughter of Judy Garland, was undergoing tests in a London hospital following an initial diagnosis of a brain tumor after she collapsed backstage at a concert in London.

The singer's representative, Victoria Varela, said the 65-year-old Luft collapsed backstage on Friday night and was rushed to the hospital, where she was given an initial diagnosis of a brain tumor.

Varela says the singer's husband, Colin Freeman, had been concerned that she was forgetting lyrics and a monologue. Luft was undergoing further tests at London's Chelsea and Westminster Hospital.

Varela says Luft has been in remission from breast cancer, which she has been battling for six years.