Lorna Luft -- the daughter of actress Judy Garland and producer Sid Luft -- has been diagnosed with a brain tumor.
Freeman informed doctors she lately had been forgetting song lyrics and parts of her monologue from the show, The Hollywood Reporter said.
The 65-year-old breast-cancer survivor underwent tests that revealed she has a brain tumor.
She is expected to undergo further exams to determine the severity of her illness and best course of treatment.
The half-sister of singer Liza Minnelli has appeared in the films "Grease 2," "Where the Boys Are '84," "54" and "My Giant," and also was a popular guest star on 1980s TV shows such as "Trapper John, M.D." and "Murder, She Wrote."