Dear Papa I can understand your pain when darling daughter is suffering !
It probably seems to be oral ulcer
It is very painful and troublesome for a kid.
But the good news is that it is easy to treat.
Continue with the antibiotic, antipyretic
Give her an anaesthetic antacid
preparation before meals, it will facilitate swallowing.
And give her liquid diet; go for foods of her choice.
Cold foods will also relieve her pain.
Give her small amounts to eat at short intervals rather than heavy foods.
If you can locate the ulcer, apply an ointment like Metrogyl
DG gel; it will facilitate healing.
Wish a speedy recovery.