Thank you for your query on Healthcare Magic.
She might have choked while swallowing the syrup.
Observe for increased respiratory rate
, coughing, wheezing
, and any change in voice.
Her throat and lungs has to be examined by the doctor to look for any aspiration of syrup in to lungs.
Chest X-ray may be needed after 6 hours on the event with the consultation of your doctor.
Therefore consult the doctor for physical examination and for treatment if any findings are present.
Hope I have answered your query.