Online campaigns

She recently discovered email and now she sends me everything about everything! I’m talking about spam!!!! I don’t want to be rude to her but I don’t want her emailing me. She needs email etiquette 101.

A fellow student in my university department is repeatedly abusing the email system, by emailing the entire department when in fact she is only addressing the few students who share her major. I have asked her several times to stop doing so, but she either doesn’t care, or doesn’t know how to do it otherwise.
I don’t want to report her to the computer admins, but it is annoying, as she is basically spamming my inbox.
Any advice?
Well, her last response was “I didn’t have time to set up a contact list of just us”.
In this case “not enough time” was a whole school year.
The problem obviously isn’t just me – it’s the whole department receiving her emails. So filtering her won’t make her stop.

I plan to write a formal letter of complaint to my university. I am sending it via email. Is it acceptable to just put it into the actual email or should it be attached as a Word document?