Ilene,
The only other time I've encountered this was in a young woman who was on the birth control pill (for acne treatment) and was also an avid runner -- marathons and such. The combination of the hormonal tricks by the Pill and the rubbing of her shirt/bra on her nipples during her runs was enough to convince her brain that she needed to produce milk!
I hope this perhaps sheds light on your colleague's situation,
Diana in NY
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