yes she can take medications for allergy for acute crisis .
I recommend see allergy specialist to perform allergt test and depend results start with new medications to prevent this allergy .

If your little one has year-round allergies they may need to take allergy medication regularly to prevent symptoms.

It is best to find the underlying cause of the seasonal allergies--usually this is done with skin testing and use of allergy shots. With shots, your child shouldn't have to use daily medications and still can control the hayfever.