The 71-year-old was found unconscious in her home Tuesday night and was taken to a Los Angeles hospital by ambulance.
She remains under observation and the website says Mitchell is resting comfortably.
The post says "we are encouraged by her progress."
Last year, Mitchell told Billboard magazine she has a rare skin condition which prevents her from performing.
Mitchell has received eight Grammy Awards, including a lifetime achievement award in 2002.
The native of Fort Macleod, Alta., was inducted into the Rock and Roll Hall of Fame in 1997 and is also a member of the Canadian Music Hall of Fame and the Canadian Songwriters Hall of Fame.
Mitchell began her career as a street musician before moving to southern California, where she became part of the flourishing folk scene in the late 1960s.
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