daughter going for biopsy now

today was her recall diagnostic mamo and ultrasound.  of course they have no records of her previous from 2 years ago in calif.  she was told very sure it's nothing more than cyst but because of my hx they want to check.  i know this is very good proactive care.  my only concern is that she just turned 35 and her fam hx is not going to go away.  she has huge, dense, and lumpy breasts.  is this going to happen every time she has a mamo from now on.  so at what point is it prudent to just keep a close watch.  maria