welcome in H.C.M.
I have gone through your query regarding post operative severe pain
operation. After considering your problem it is clear that your daughter had developed secondary infection, because she have severe pain which is not permitting her to even swallow her saliva,there is lot of swelling which does not allow the oral tablets to pass in ,she had mild fever
Prompt treatment for secondary infection should be started now otherwise she may develop secondary hemorrhage which is supposed to be an emergency.
She should be treated as under-
(1) Bed rest
(better she remain hospitalised )
(2) Injectible antibiotics should be given
(3) Anti-inflammatory should also be given parentaly.
(4) Antiseptic gargling should be made 5 to 6 times in a day to maintain the oral heygine.
(5) Orally only cold
liquid and semisolids are allowed.
I don't know about her blood sugar, if she is found diabetic than that should be taken care of.
Hope your query is explained