Cat is scratching her ears

The stray I took in is scratching her ears. I've given her a revolution but she's still scratching just like my cat used to when she had ear mites. Is there any chance she has ear mites even after the revolution?

Its possible.
My cat had this bad infection in his ear and it eventually grew some nasty looking red thing, and it had to get removed by a vet. It was disgusting, I would get the cat looked at if it gets bad.

She was at the vets like a week ago, she had a check up and shots and spade etc... That's why I dont get what's wrong with her...

Get some earmite meds from the pet store and see if it clears up...she may have allergies, also...well, dogs seem to go for their ears and feet if they're having allergy problems...

phrannie

Can I put more meds on top of revolution?

I would get her back to the Vet's, it is very possible the infection of what ever she has going on in her ears hadn't manifest itself until after she got home.

take her to a vet and the chances of her getting ear mite again is 8 out of 10

Could be possible.