Breast Cancer Recurrance- location statistics?

After a woman competes her surgery/chemo/radiation therapy she gets mammograms/ultrasounds/breast MRI's on a regular basis for about 5 years and is then "cut loose". Why isn't the rest of the body checked during these years? Why is the head/brain not checked at all?

Does anyone have recurrance statistics on (1) odds that it'll return to the breast vs. (2) chances it'll have mestasticized.

I would think catching option (2) early can save a life but waiting until the patient has a problem is usually too late and a death sentence. I am losing a friend who probably won't make it to the end of year- her cancer spread to her brain, lungs, and liver.