She could simply have arthritis. I was diagnosed when I was 29. I go into flares that leave me barely able to get around--90 year olds move faster than me sometimes. Then it will simply go away for months, even years and I'm fine. . . until it comes back again. There are all types of arthritis and it can range from mild to debilitating. It also is very common for it to set-in after joint injuires. I can't answer why she'd wear high heels in her private life but not on stage. Maybe she just feels more secure in the platform reeboks on stage.
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