If your daughter has been coughing for several months, especially when lying down, with lots of secretions and what sounds like bubbles in her lungs, it is advisable to consult a doctor. If the coughing persists despite daily use of Sinus Rinse, a medical examination may be necessary to determine if antibiotic treatment is needed. It is important to address any concerns about your daughter's health, especially if she has recently had a high fever and is being disrupted during sleep. Seek medical advice to ensure she receives the appropriate care.