Thank you for your query,
As your daughter is examined by your Psychiatrist
, and diagnosed as Compulsive -onsessive disorder, you have to continue the medication as per the doctor advise.
Obsession are inappropriate recurrent and persistent thoughts that caused marked distress and anxiety
Sertaline is an antidepressant drug and is useful in compulsive obsessive disorder
So continue the medication as prescribed.
Hope I have answered your query.