Doubt on everyone. Doctor immediately?

My wife is a Biopolar disorder patient. Recently we blessed with a baby girl and after 3.5 month of delivery my wife fall in depression, crying, absent minded, careless to our child, we went to our psychiatrist, doctor prescribed Olanzapine 5mg tablet (4 tablets before dinner) and Lithium SR 450mg tablet(2 tablets after dinner). Since 2 week she is taking these medicines and she is ok now. But she developed a little doubt for every one, like she is thinking that we are talking in her back, or she is thinking that there is something that we are hiding from her. But she know that these doubts are happening by the episode. I want to know that how long these doubts will stay? Will this doubt full mind disappear automatically? Do we need to report to the doctor immediately?