If she's not cramping that is a good sign. Like the last poster said though she does need to be checked out to make sure everything is ok. I bleed for almost 5 weeks straight during the beginning of my pregnancy and now have a healthy 14 month old daughter to show for it.
It is possible but her doctor needs to see her to make sure that everything is okay and nothing is wrong with her baby because cramping can usually mean something's wrong if they are period crapms.