Try to find out what is making her itch. It may be something simple.
Before you go down the Advantage or spot road be carefull
My cat was 8 years old. Never had a days illness or any problems with fleas.
Suddenly she had a big flea and itch problem.
The vet gave her Advantage spot on,she got horribly sick and died within two weeks.
I learnt that cats and dogs can have have problems with fleas when their immune system goes down. She had had a fight with a tomcat two years and the vet thinks she caught cat aids from him. The Advantage immediately made it worse.Have a blood test first if you can. Find an alternative flea remedy if your dog comes out positive.
They have new vaccinations out now for all the cat diseases, I probably will not have another cat because its to upsetting and i am wary of vaccinations because i dont trust the chemical companies any more.