I would like to suggest that the mother consider pumping with a Whisper Wear pump.  She can wear it under her clothing and pump while she is teaching.  She can turn it off when she is done, and the milk can remain in the bags under her clothing until her next break.  She just needs to be careful not to bend over and touch her toes, as pinching the bag in the bend of her body would send the milk squirting out of the top of the bag.
 
Dee Kassing
  I do sell these pumps in my private practice office, along with other brands; but I do not own stock in the company, so very unlikely that I would make any money by recommending this to this particular mother, since she probably lives nowhere near me.  :)

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