Thank you for your query..The symptoms that you are mentioning can be sinister. The swelling may represent a peri/paratonsillar abscess
or an enlarged adenoid
gland.If this swelling is obstructing her breathing then it might be dangerous. Do not panic and get you child examined by a good ENT surgeon.She might need an Xray or CT scan
.I hope this helps you out. Wishing her a speedy recovery.
Have a nice day