It may take a day or two for the itching to die down if you just sprayed her with Frontline. Flea allergic dogs can itch all over from just one bite and Frontline takes a little while to work.
You can see if using some plain Benadryl at a dose of 1mg per pound of pup will help control itching while the flea product works.
You can give her some Benadryl every 8 hours but it may make her sleepy.
If you are feeding a grocery store food you may also find that swapping to a higher quality food may help. And if you smoke or use scent diffusers or carpet cleaners any of those might be an issue too.
Hope this helps you!
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