short answer: Don't schedule a good time to go to the doctor, just go.
Longer answer: Mine feet look like that also, but more on the balls of my feet and big toe, not the heels. But mine is attributed to wearing work boots and walking on concrete 12+ hours a day at work. it may be part of a larger issue. I would be more worried over the blue legs. if it is occurring in both legs, it may be one of several issues. The most severe being a blocked artery or vein that is slowing down the blood flow enough to cause the issue. When her legs return to normal, the blockage may be breaking free allowing blood flow to normalize for a short time span. If this is the issue, and the blockage makes it's way to the heart, its game over. Go now.
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