Its very likely she is itching as she is sensitive to flea bites. Just one bite can set off the itching.
You can see if some plain Benadryl will help her. A common dose is 1mg per pound of dog every 8-12 hours. Might make her a little sleepy.
You may also want to spray the floors in your house with a spray to kill adult fleas and keep the eggs from growing up to biting stage. I use Zodiac Fleatrol spray which you can see here
http://www.upco.com/cgi-bin/Upcol.storefront/4515a943002ecf82ea6fc0a80aa5070a/Product/View/56092
Pet supply stores also carry it. It works well at my house to eliminate any flea infestations.
Hope this helps you!
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