Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain Croup is a Viral infection causing Cold and cough, fever, and
difficulty breathing due to narrowing of respiratory passages due to infection causing inflammation..
Shivering or tremors can be due to
febrile convulsions caused due to
high fever secondary to infection..
You need not to worry as when the fever will reduce the tremors will also subside..
You can give her
Tylenol for reducing fever..
Increased breathing is due to an attempt to avail more oxygen to breathe as she must be finding it difficult to breathe..
You can give her Steroid
nasal spray, steam inhalation and decongestant nasal drops for opening nasal passages and helps in breathing..
Make her sleep with chin down and keep pillows below her head as it will ease in breathing..
In case of no improvement consult her treating physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.