Legendary folk singer Joni Mitchell remains hospitalized in intensive care after collapsing at her L.A. home on Tuesday.

Her official diagnosis is still unknown.

Mitchell, 71, has said in recent years that she suffers from several conditions including Morgellons Disease, a medical mystery that includes lesions and irritable fibers underneath the skin.

“Joni remains under observation in the hospital and is resting comfortably,” her official site said late Friday. “Her progress is encouraging as she continues to improve each day.”

Mitchell is also a lifelong smoker who has said in the past that “six decades of smoking have robbed me of my voice.”

The eight-time Grammy winning musician, now 71, is known for songs like “Both Sides Now,” “The Circle Game,” “Free Man in Paris” and “Help Me” and helped define the Laurel Canyon sound of the 1960s and ’70s. Her songs, such as “Big Yellow Taxi” and “River,” have been famously covered over the years.

Mitchell’s most recent album of original music, “Shine,” was released in 2007. A four-volume boxed set, “Love Has Many Faces: A Quartet, A Ballet, Waiting to Be Danced,” came out in 2014.