She needs psychiatric help. This is very treatable.

OCD is a debilitating psychiatric problem. Therapy and appropriate medicine arrangement can help.

OCD is a disease and it responds very well to therapy and medication. Good luck!

It is indeed a condition that can worsen...recommend seeing a psychiatrist for further evaluation of all of her symptoms and appropriate recommendations from that evaluation..you’re a great sister to care and find her help, Dr. Amy

There is nothing that you can do about it, she needs to get help. You can't force her to get help but she needs to see a psychologist or a psychiatrist to get treatment.

Yes it is a psychiatric d/o. Please seek help.

OCD is and can be all consuming. It creates a dysfunctional life and needs to be treated.

OCD is a psychiatric issue that can be treated. Pacing can be related to it and is distressing for patient as well as family. Schedule her with a psychiatrist for assessment and management.

Yes, OCD is a disease/mental illness, but it has to be diagnosed properly by a psychiatric evaluation. In your sister's case, with this little information, it seems like more of anxiety, but as I said before, she needs to be properly evaluated. Good news is that both of these illnesses are treatable.

You are a Caring Person.
I understand your concern about her pacing around the house. This is not a typical sign of Obsessive-Compulsive Disorder (OCD).
Please write all her Obsessions which she has expressed to you, and all her Compulsive behaviors which you have observed.
Express your concerns about her behaviors; and advise her to see a Psychiatrist for Diagnosis and Treatment.

It is a disorder. Talk with her about it, though I can't know if it is OCD or something else.