Hi Hollytree
What flea treatment are you using? Can you get hold of Frontline? Its a pipette that you apply to a small area of skin between the dogs shoulderblades, and she will be free of fleas ticks etc in 24 hours. They only have to be treated every three months thereafter.
I use it on my dogs and it is superb, even though they go swimming regularly.
Your dog will get total peace with it. Its only available from the veterinary, however, as far as I know.