Always have cough, cold. About her?

dear practo user looking at your sisters details it seems to be like allergic problems which can be properly diagnosed only after proper CHECKUP for which you need to consult first nearest doctor who will ask you other details.....but surely i will tell you allergic problems are totaly permenantly solvable without any Steroids or sedatives or antiallergic drugs and that too without any side effects but in condition continue the course of treatment atleast 4-5months of HOMOEOPATHIC TREATMENT

Take homoeomedicines 1. Nux vom 200-3doses alternate night 2. Nihilinum 200-6-6-6 pils for 2wks  revert back after 2wks

possibly try to avoid all such kind of medications or syrups and take lukewarm plane water for frecquent Gargling and drinking purpose

Prevention of Cold and Allergies. Increasing Immunity. 1. Stay away from Dust and Pollution. 2. Increase your immunity, eat plenty of Fruits and vegetables. 3. Keep Hydrated. Drink plenty of water and soups. 4. Exercise - Make it a habit to exercise or run for 45 minutes daily. This will improve your immunity. 5. Green Tea - Drink green Tea and coffee , They contain flavnoids and will.improve your immunity. 6. Multivitamin - A good multivitamin of Antioxidants will also help you avoid cold and allergies . 7. Avoid eating outside food .  8. Handful of nuts like walnuts and almonds will improve your immunity to fight of the cold and allergies. 9. Maintain Healthy weight. 10. Yoga may also help in improving once immunity and inner strength.

also get vaccines . influenza once every year and Pneumococcal polysaccharides Vaccine once in a lifetime

Also make a private consult with me for a perfect treatment protocol

Dear friend, your sister having cold and cough throughout the year even after covering her nose suggests it's less likely to be allergic. It might be due to some polyp or chronic sinusitis( if associated with headache). Kindly check with an ENT surgeon in person. hope this helps. regards.