Need help dealing with a recurring dream (this is not a joke)

OK. There’s someone from my past that, although I haven’t seen her in 15 years, continues to plague my dreams intermittently. No, I do not still love her. No, I do not wish we could get back together. What I want is to stop being blindsided a few times each month with unpleasant dreams involving her. Has anyone successfully exorcised any particular subject or person from their dreams? Should I try hypnosis? Some other new-age method that I intellectually laugh at but am more than willing to try? I’m desperate. I’m willing and eager to investigate any/all possible solutions. Help?