She's out of hospital. CNN article has pictures, so it really happened.

Despite her recent health problems, altitude tests revealed that the 18-time grand slam singles champion had the lungs of a 25-year-old. However, the Laureus team was forced to face difficult weather of blizzards and mists during the climb.

"Doctors say the experience will have no effect to Navratilova's long-term health, and that patients get back to full fitness after recuperating.
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Verum audaces non gerunt indusia alba. - Ipsi dixit MCMLXXII