can be due to the clogged up secretions (phlegm) in the throat which will be difficult for her to swallow it or bring it out which leads to retching
and vomiting. She requires humidified air in the form of saline nebulization to bring out the phlegm or to liquidify it. saline nasal drops can be used as well 3-4times/day to reduce nasal congestion
. I feel you need to consult a good child specialist/chest physician and get the child treated.
Dr. Naveen Kumar