Answer:
I am not 100% sure about my answer, so don't hate me if i get it wrong, but I think that Kelsey has Obsessive-Compulsive Disorder
My explanation - Obsessive-Compulsive Disorder (OCD) is a common, chronic and long-lasting disorder in which a person has uncontrollable, reoccurring thoughts (obsessions) and behaviors (compulsions) that he or she feels the urge to repeat over and over.