Teddi Mellencamp is in therapy to process her experiences as she battles cancer. 8 Teddi Mellencamp is seeking therapy amid her cancer battle. “I can see that I’m slower than I was before, and that’s really frustrating to me. The reality TV star also addressed her father John Mellencamp’s recent assertion that she’s “suffering” — which touched off a fresh wave of concern among fans. teddimellencamp/Instagram8 She also addressed her father John Mellencamp’s recent comments about her cancer battle.