Thank you for your query.
It is very difficult to give any suggestion without having a look at the bumps that you are describing. They can certainly be bug bites but they are not going to have change with coritsone ointment. However if they are infective then cortisone
can make them worse. I suggest that you consult your doctor who shall be in a better position to guide you further.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early recovery.