good morning, the treatment line is fine, but before giving any medication for an infant its always better to consult with your doctor. regarding the blocked nose, you can give her nasal drops containing saline in it, but if its too severe , nasal drops containing pseudoephidrine for pediatric use can be given , but not very often, and should be well within the range of the doseage limits. so better review with your doctor.
the frequent cold
and blocked may cause middle ear infection
. so kindly review with your doctor for better out come.