Chena,
WOW, what a miserable experience for your little girl !
I really don't have any specific advice for you, just
emphasizing I suppose.
I have one who is "itching" some...
but the Vet told me it was a reaction to a Flea Bite,
and we're changing protection meds and will see what happens.
Anyway, my sympathies for your little one
I know how aggravating it is for you and it.
Have a good Day !
S.W.