Hi,
Just a couple other thoughts on the chronic plugged ducts as well as
trying lecithin.  Does this mother nurse as often or as long
(thoroughly?) as on her days off at home.  Could be incomplete emptying.
Could also be increased stress from working, or lack of sleep as
contributing factors perhaps.  Also, is her wardrobe any different when
she is at work?  (straps on clothing, bags, purses, etc., tighter
bras,).  I had recurrent plugged ducts with child #2 because I was
wearing bras from child #1 which no longer fit so well.  The problem
immediately resolved when I bought new bras.  Hope this helps.

Kris Rogers