Sorry for the novel, but ... Why can't she just be grateful?

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I've been working at a job for the past 10 years. For the past two years one of the people the owner hired started bringing his girlfriend to work with him every single day. The company has a very laid back atmosphere. The owner is offsite 95% of the time so he has no idea who comes and who goes at the job. I haven't told on them because of "insert-reason-here". Well, since then, the girlfriend started doing work like she's an employee, but she didn't know HOW to do the work. "How does this work?" "I think we're supposed to do it like this?" she would say to the boyfriend. Then, after awhile, I noticed her looking down towards MY area and she started watching ME... and started copying everything that I was doing. Cut to months later, the man and his girlfriend have become emboldened and now they frequently bring OTHER people to the job site to hang out. Me, I'm quiet and do my work, other people who the owner hired ignore what's going on with this rogue employee who brings relatives to the jobsite. But here's the thing, the girlfriend tells these visitors of theirs that I copy HER. And it's like, "No honey, you learned this job from ME... and you're not even supposed to BE here." The office is divided into sections. On Friday nights I'll clear off my tables, put everything away so that nothing is left on top of desks, wipe everything down with Clorox wipes, put the chairs on top of the tables so the night cleaning crew can clean. In the man and girlfriend's section, every Friday night stuff would be all over the tables, pieces of paper all over the floor. A couple months of that and then she started taking all of her papers off the tables, chairs up, even started using Clorox wipes. For lunch I'd bring homecooked meals, or even cook simple stuff, fry up vegetables in the kitchen wok. They use to order out everyday, until one day she started cooking in the kitchen, frying vegetables in the wok and telling people to look at ME, how I was going to use the wok because SHE does, and I'm copying her. File room... mail room. When whiteout or printer ink ran out, the girlfriend would say, "Oh we have to pick up a bottle of whiteout when we go to lunch." Me? I'd order a whole few boxes of whiteout and have them delivered, same with the printer ink. Next thing you know, she's doing the same thing ordering in bulk and telling her not-supposed-to-be-there-visiting cronies, "Look, she got a case of paper delivered just like I did yesterday." And it's like, "No honey, you learned this job from ME... and you're not even supposed to BE here." If I spoke to her at all, because I don't, I would also say, "Yes, I had a case of paper delivered because that's how things work in an office, and I've been doing it for 8 years before you ever got here." Ugh. And of course her cronies STOMP past my area and try to bug me. Why can't she just be quiet and be grateful that's she's learned how to do certain stuff instead of lying and talking junk about me? Has this ever happened to you? Your thoughts??