I get the more typical PF like you get most often, but too I get the heel pain. My stepfather with crohn's gets the heel pain predominantly.
These helped him a lot:
http://www.amazon.com/Tulis-Heavy-Regula...words=heel+cupsThe heel cups make other parts of my foot inflame; my feet only like to be flat.
But have her try the heel cups; my stepfather swears by them.
I found I could keep my heel pain under control by wearing rubber flip flops anytime I stand in the hard floored shower. I also stand on a rubber / foam mat when standing working in the kitchen. These things help my heels a lot from getting bad in the first place.
When bad, ice helps. The frozen water bottle or a can of tomato paste in the freezer.
Gotta be careful about stretching; don't want to tear anything.