Thank you for your query and am sorry for responding to your query so late.
Your query does not mention the organism grown from the sinus infection
. If the organism grown is Citrobacter Koseri
then we can blame the gut.
Removal of adenoids
and tonsils does not prevent subsequent upper respiratory tract
infection (URTI). From 1-2 year of age onwards till about 5-7 years children tend to get repeated URTI as they develop their immunity to various organisms. From your comments I presume your daughter's immunoglobin levels were normal.
My recommendation will be to treat the sinus infection under supervision of an ENT specialist
and ensure that your daughter has a good well balance nutritious diet for her immunity levels to improve. Necessary supplements may be added but should not replace a nutritious diet.
I hope I have answered your query to your satisfaction.
Wishing your daughter all the best.