Should I see the doctor?

My 4 month old daughter has had a cough for 2 weeks going on 3 now. The first weeks the doctor told us she had a sinuous infection, then week 2 it turned into RSV and now going into week 3 she just has this horrible cough that keeps her up at night. I’m not sure if I should call the doctor again or if I do they will just say to wait it out.