Peronal Hotspot using up bandwidth

My wife is a teacher and is using her personal hotspot in her classroom for her laptop since there is no WI-fi in her building yet. She is blowing through our data plan even though she cannot understand what could be using it. Does anyone know of a utility that she can install on her laptop that will tell us what site is using up the data? We are pretty confident that it is not a student hacking into her hotspot.


Any suggestions would be appreciated.