Hello Lung infection leads to collection of inflammatory cells and other substances with in the respiratory tract which may appear on X ray as consolidation or thickening. Peribronchial thickening means inflammation in the wall of bronchi. Here I would like more information to help you better What all symptoms she is having and what all medicines has been given to her with other related medical history In my opinion she may require a course of antibiotics and anti allergic drugs with supportive care like cough syrup or steam inhalation. Honey with few drops of ginger juice may be beneficial in case of chronic cough Hope this answers your question Please feel free to ask for more assistance. Best wishes