Hello starfruit504: First off what occurs to me is that, if I were in this situation, I would block this person's e-mails. You wrote that you don't work with this person. So I take it there is no reason why you have to be receiving her e-mails. From my perspective, any opportunity you give her to continue to harass you is just adding fuel to the fire, as they say...
For me, this situation is troubling. I don't know anything about the company you work for, or who your boss is. But, unless he's the owner, & he's just always going to be there as long as the company exists, I would be skeptical about his being on your side. Perhaps he is... perhaps he isn't. But, either way, people come-&-go. If he leaves, or gets promoted, etc. how might his replacement view all of this? What is being entered into you Personnel file... assuming there is one, of course. How is all of this being viewed by others who are not directly involved... for example, other employees this person may be talking to?
The bottom line here, from my perspective, is that this is a situation that could unexpectedly come back to bite you at some point. Letting it continue to fester, may serve your boss because then he doesn't have to deal with it. But, again from my perspective, what would be in your best interest would be for the company to do whatever is necessary to bring this abuse to a conclusion as quickly & permanently as possible. I wish you well...