Why have I had cough for 2 months?

It's important to have her evaluated by a specialist. While she may not have any known health issues, this symptom could indicate an underlying problem that requires attention. 

if this is bronchitis, the problem is that there may be some swelling inside her lungs’ airways. It causes coughing, mucus and sometimes fever too. Give her lots of water to drink and let her have enough bed rest. Additionally, consider buying an OTC cough syrup with dextromethorphan for her. This will relieve the irritation in the throat making the cough less frequent and more productive. Do not exceed the recommended dose on the label without consulting a doctor or pharmacist first. 

Maybe you are an asthma patient. The changing seasons can be the reason for the asthma symptoms intensified by pollen. Various symptoms are observed such as shortness of breath, wheezing, and feeling of being out of breath. The underlying cause is the body's hypersensitivity to certain substances known as allergens. The treatment is to utilize a doctor-prescribed inhaler can assist in more effective breathing. Dust and pollen are some triggers that should be avoided.

Post-lobectomy, regular deep breathing exercises, and pulmonary rehabilitation can help improve lung capacity.

A persistent cough and runny nose could indicate whooping cough, especially if your baby recently had a fever and took antibiotics. Whooping cough is a contagious respiratory infection that causes severe coughing fits. Make sure your child rests, drinks plenty of water, and uses a cool-mist humidifier to ease the cough. Monitor their condition and contact their doctor if you have further concerns.