keep the mileage low, and at the first sign of any localized soreness in the area of the fracture, stop running and scale back weekly mileage. Avoid the temptation to start speedwork. Supplement mileage with pool running. (a good pool running plan
http://www.pfitzinger.com/labreports/water.shtml
) The most important aspect of recovery is to be patient and to listen to the body, if she rushes too quickly into heavy training again the she runs the risk of re-injury and compounded effects down the line...
The most important part of the equation is breaking the cycle of injury to insure that she doesn't get hurt again. Things that can help are going to a specialty running store and getting fitted for the correct shoes. Use this time as a base phase to build the rudimentary support muscles and work core strength.