OCD is on the spectrum with anxiety... it is a form of anxiety, actually, and she sounds like she could well be in the early stages of it. The one Mom below described it perfectly: Obssessive thoughts, worries, or fears, that a person can't control and then the rituals they do to deal with those thoughts.
My son never liked getting dirty when he was younger. When he was a toddler, he wouldn't feed himself because he didn't want to get dirty and I had to wipe his hands in between bites. I joked to my friends that he was "anal and stubborn" and my mom joked he was "so OCD". Now I have to force him to wash his hands. Instead, he worries and worries about every little change in his life. He'll talk about things that have nothing to do with what's happening in the present, but he's still dwelling on it anyway. He chews his shirts collars to shreds and pokes his socks until they have holes. The handwashing all day is actually a germophobic version of OCD that is pretty extreme, and not the norm. The opposite extreme are the packrat types that can't let any item go for any reason (my son). My son's teacher last year had a teenager daughter with OCD, and she told me it worsened with age, until she was going to a psychiatrist several times a week. She had to take showers just because she got the mail (she said, "well, she only takes 4 or 5 a day now, so it's getting better.") I think her particular issue was sweat. I bet that's a hard compulsion to live with here in Florida. Every weekend her daughter rearranges her room and certain items have to always face the window. I'm praying it never gets that bad with my son, but I'm thinking we're going to need a good child psychologist soon... I can't take him chewing through his clothes anymore.
Sorry this doesn't really offer any advice, other than keep your eyes open... Good luck.