I do believe that you can gine her Capstar. If I remember correctly, it is safe for pregnant and lactating cats. It kills the feas almost instantly. They are all gone within a day. Of course then you have to go through the next couple days finding dead fleas lying around the house, eww!
Anyways, talk to your vet, maybe you can give that to her and it will help alot!
Anyways, talk to your vet, maybe you can give that to her and it will help alot!