What should I do for my daughter who seems to have breathing difficulties?

It is recommended to prioritize nasal hygiene and taking antihistamines such as Claritin, Reactine, or Aerius for nasal symptoms. Other non-pharmacological measures to consider include avoiding keeping windows open in dry or windy weather, changing clothes after being outdoors, washing hands regularly, and avoiding drying clothes outside. If there is no improvement after two weeks of starting these measures and using inhalers, it is advisable to seek medical advice for reevaluation.