Primary complex is condition where there is a lymph node enlargement in the chest which is seen on X-ray chest with some parenchymal (lung) involvement. Lymph nodes outside chest are not defined as primary complex. Ideal way to confirm the diagnosis of tuberculosis is to document ther tubercular germs either from lymph node or from sputum/secretions obtained from the lungs.
Your baby is not malnourished and her diet is pretty OK.