Jealousy rears its ugly head

So I told the coworker who has been treating me badly about my new job this morning. She said, "What makes you think YOU can do HR work?" That was it She ignored me most of the day except to make another rude comment about how I won't be going to the seminar I have been helping with if I was training someone. I said, "That's my last day. . .that's not my concern. I'm going to the training and going home." Everyone just looked at me with shocked looks on their faces. She is one of those people who are miserable in her life and she hates to see someone else do well. It's as though the smaller I get and the happier I become. . .the meaner she is to me. Is this jealousy? My other coworkers were shocked today too when she sent me an email telling me (not asking) to make sure I clean my desk today and put everything away because it bothers her that my personal things are out when she does the mail for me when I'm gone. I'm going to be out on Monday. The good thing is that the next three weeks will go by very quickly and when all is said and done. . . I will be off to start a career with better pay than she makes. . . and she will still be there. I won't have to deal with it anymore. The other job doesn't know what I looked like before. They just know me for who I am now. I feel bad for her. I really do hope that she finds a way to let some happiness in her life. Mainly. . . I'm just hoping she doesn't try to make my last three weeks miserable.