As earlier, I'm not qualified to say if she has OCD or not but the fact that she has compulsions which are required to lessen anxiety would point me in that direction. It's worth asking the Doc.
One of the problems with OCD is that because anxiety and depression are a result of it, and they're easier to recognise for Doctors and patients so they treat the symptoms rather than the cause. It's often mistaken as "generalised anxiety" because you don't know that your compulsions are mad at first and feeling like you're a knobhead because you're doing something stupid is a good way to encounter constantly low mood. Although there's evidence that SSRIs do have an effect in lessening obsessive thoughts, so people with OCD get slightly better when on anti-depressents/anti-anxiety meds so they and their Doctors feel that they're probably moving in a positive direction. And when you've been feeling like shit for many years, even a slight improvement feels like you've cracked it because you're desperate to feel normal and are willing to buy into it.
OCD is a treatable condition with psychotherapy, CBT and other factors. The key is breaking the cycle as although you might work to stop cleaning the kitchen, you'll soon replace it with something different. Most of OCD is in your head rather than something you can physically see - becoming obsessed with certain numbers is a thing for some people (and it's important to say that just because somebody doesn't have all symptoms doesn't mean that they don't have OCD, it presents in different ways in different people, it's the suffering that defines it rather than the activities).
Once I was in school and was getting the train back from Hale to Altrincham. Short run but you could get away with smoking at the train station without teachers driving past. Anyway, I remember feeling a bit ill (though I now see it was anxious before I knew what anxious meant) so I started counting in my head to focus on something else. When I reached the number 23 the barriers at the train crossing started beeping as the train was arriving. Since that day I gave the number 23 some weird magical significance personally. When Foe died and City retired the number, this just confirmed to me that the number had some special meaning. So whenever I'm "white knuckling" a journey and trying to create a new chain of safety, I often count to 23 in my head repeatedly because it's a number that is safe.
Again, I logically understand that that is mental. 23 is no more special than 22 or 24 or 16. But that's not the point, the point is to distract yourself and my brain has "evidence" that 23 is a lucky number to some degree so in counting to it I'll be okay.
Some people stick headphones on so loud that they suffer hearing loss in later years. Others repeat certain bits of poetry or some paragraphs from a book. I can tell you that the exact speed of light in a vacuum in kilometres a second is 299,792,458 km/s because it's a number that I also repeat often. Anything at all that will stop you thinking about a certain thing is a valid technique in your logic.